diff --git a/MultiNode-Tester/MultiNode-Tester.ino b/MultiNode-Tester/MultiNode-Tester.ino
index 0abaa3a..9ede24e 100644
--- a/MultiNode-Tester/MultiNode-Tester.ino
+++ b/MultiNode-Tester/MultiNode-Tester.ino
@@ -2,7 +2,7 @@
#include <RHReliableDatagram.h>
#include <RH_RF95.h>
#include <SPI.h>
-#include <TemperatureZero.h>
+#include <TemperatureZero.h>´
#define CLIENT_ADDRESS 1
@@ -36,7 +36,7 @@ RHReliableDatagram rfManager(rfm95, CLIENT_ADDRESS);
TemperatureZero TempZero = TemperatureZero();
-void setup()
+void setup()
{
// Pins with internal functions
pinMode(BOOSTEN_PIN, OUTPUT);
@@ -44,75 +44,84 @@ void setup()
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, HIGH);
- // Acivating Motor and Digital Outputs, but at LOW level
- pinMode(10, OUTPUT);
- digitalWrite(10, LOW);
- pinMode(12, OUTPUT);
- digitalWrite(12, LOW);
-
- pinMode(6, OUTPUT);
- digitalWrite(6, LOW);
- pinMode(7, OUTPUT);
- digitalWrite(7, LOW);
-
- // explcitly activate inputs, to avoid conflicts
- pinMode(38, INPUT);
- pinMode(2, INPUT);
- pinMode(5, INPUT);
- pinMode(11, INPUT);
+ /*// Acivating Motor and Digital Outputs, but at LOW level
+ pinMode(10, OUTPUT);
+ digitalWrite(10, LOW);
+ pinMode(12, OUTPUT);
+ digitalWrite(12, LOW);
- // Configuring ADC
- analogReference(AR_INTERNAL2V23);
- analogReadResolution(12);
+ pinMode(6, OUTPUT);
+ digitalWrite(6, LOW);
+ pinMode(7, OUTPUT);
+ digitalWrite(7, LOW);
-
- SerialUSB.begin(9600);
- //while (!SerialUSB) ; // Wait for serial port to be available
+ // explcitly activate inputs, to avoid conflicts
+ pinMode(38, INPUT);
+ pinMode(2, INPUT);
+ pinMode(5, INPUT);
+ pinMode(11, INPUT);
-
- if (!rfManager.init())
+ // Configuring ADC
+ analogReference(AR_INTERNAL2V23);
+ analogReadResolution(12);
+
+
+ SerialUSB.begin(9600);
+ //while (!SerialUSB) ; // Wait for serial port to be available
+
+
+ if (!rfManager.init())
SerialUSB.println("init failed");
- rfm95.setModemConfig(MODEM_CONFIG);
- // Defaults after init are 434.0MHz, 13dBm, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on
+ rfm95.setModemConfig(MODEM_CONFIG);
+ // Defaults after init are 434.0MHz, 13dBm, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on
- // The default transmitter power is 13dBm, using PA_BOOST.
- // If you are using RFM95/96/97/98 modules which uses the PA_BOOST transmitter pin, then
- // you can set transmitter powers from 2 to 20 dBm:
- rfm95.setTxPower(MODEM_POWER, false);
- rfm95.setFrequency(MODEM_FREQ);
+ // The default transmitter power is 13dBm, using PA_BOOST.
+ // If you are using RFM95/96/97/98 modules which uses the PA_BOOST transmitter pin, then
+ // you can set transmitter powers from 2 to 20 dBm:
+ rfm95.setTxPower(MODEM_POWER, false);
+ rfm95.setFrequency(MODEM_FREQ);
- // You can optionally require this module to wait until Channel Activity
- // Detection shows no activity on the channel before transmitting by setting
- // the CAD timeout to non-zero:
- // rfm95.setCADTimeout(10000);
+ // You can optionally require this module to wait until Channel Activity
+ // Detection shows no activity on the channel before transmitting by setting
+ // the CAD timeout to non-zero:
+ // rfm95.setCADTimeout(10000);
-
- // on-chip teperature sensor
- TempZero.init();
- // activate all five "outputs" for a short period during startup (left to right)
- digitalWrite(BOOSTEN_PIN, HIGH);
- delay(1000);
- digitalWrite(BOOSTEN_PIN,LOW);
- digitalWrite(10, HIGH);
- delay(1000);
- digitalWrite(10,LOW);
- digitalWrite(12, HIGH);
- delay(1000);
- digitalWrite(12,LOW);
- digitalWrite(6, HIGH);
- delay(1000);
- digitalWrite(6,LOW);
- digitalWrite(7, HIGH);
- delay(1000);
- digitalWrite(7,LOW);
+ // on-chip teperature sensor
+ TempZero.init();
- // Print Status Report
- PrintSR();
+ // activate all five "outputs" for a short period during startup (left to right)
+ digitalWrite(BOOSTEN_PIN, HIGH);
+ delay(1000);
+ digitalWrite(BOOSTEN_PIN, LOW);
+ digitalWrite(10, HIGH);
+ delay(1000);
+ digitalWrite(10, LOW);
+ digitalWrite(12, HIGH);
+ delay(1000);
+ digitalWrite(12, LOW);
+ digitalWrite(6, HIGH);
+ delay(1000);
+ digitalWrite(6, LOW);
+ digitalWrite(7, HIGH);
+ delay(1000);
+ digitalWrite(7, LOW);
- // switch of LED after startup
+ // Print Status Report
+ PrintSR();
+
+ // switch of LED after startup
+ digitalWrite(LED_BUILTIN, LOW);
+ rfm95.sleep();*/
digitalWrite(LED_BUILTIN, LOW);
+ for (int i = 0; i < 10; i++)
+ {
+ digitalWrite(LED_BUILTIN, HIGH);
+ delay(100);
+ digitalWrite(LED_BUILTIN, LOW);
+ delay(100);
+ }
}
@@ -125,17 +134,40 @@ uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
void loop()
{
+ while (!USBDevice.connected())
+ {
+ LowPower.sleep(1000);
+ USBDevice.init();
+ }
+ for (int i = 0; i < 10; i++)
+ {
+ digitalWrite(LED_BUILTIN, HIGH);
+ delay(100);
+ digitalWrite(LED_BUILTIN, LOW);
+ delay(100);
+ }
+ /*if (USBDevice.connected())
+ digitalWrite(LED_BUILTIN, HIGH);
+ else
+ digitalWrite(LED_BUILTIN, LOW);*/
+ return;
+ digitalWrite(BOOSTEN_PIN, HIGH);
+ delay(2000);
+ digitalWrite(BOOSTEN_PIN, LOW);
+ delay(2000);
+ LowPower.deepSleep(4000);
+ return;
/*
- SerialUSB.println("Sending to rf95_reliable_datagram_server");
+ SerialUSB.println("Sending to rf95_reliable_datagram_server");
- // Send a message to manager_server
- if (rfManager.sendtoWait(data, sizeof(data), SERVER_ADDRESS))
- {
+ // Send a message to manager_server
+ if (rfManager.sendtoWait(data, sizeof(data), SERVER_ADDRESS))
+ {
SerialUSB.println("...got an ACK");
// Now wait for a reply from the server
uint8_t len = sizeof(buf);
- uint8_t from;
+ uint8_t from;
if (rfManager.recvfromAckTimeout(buf, &len, 2000, &from))
{
SerialUSB.print("got reply from : 0x");
@@ -147,29 +179,29 @@ void loop()
{
SerialUSB.println("No reply, is rf95_reliable_datagram_server running?");
}
- }
- else
+ }
+ else
SerialUSB.println("sendtoWait failed");
*/
-
+
// TICK-ROUTINE
- if(LoopState && millis() > nextTick)
+ if (LoopState && millis() > nextTick)
{
- switch (LoopState){
+ switch (LoopState) {
case 1: // Read and print Currents
- SerialUSB.print(float(analogRead(A1))/DIVIDER_mA, 3);
+ SerialUSB.print(float(analogRead(A1)) / DIVIDER_mA, 3);
SerialUSB.print("\t");
- SerialUSB.print(float(analogRead(A2))/DIVIDER_mA, 3);
+ SerialUSB.print(float(analogRead(A2)) / DIVIDER_mA, 3);
SerialUSB.print("\t");
- SerialUSB.println(float(analogRead(A3))/DIVIDER_mA, 3);
+ SerialUSB.println(float(analogRead(A3)) / DIVIDER_mA, 3);
break;
case 2: // Read and print Voltages
- SerialUSB.print(float(analogRead(A1))/DIVIDER_V, 3);
+ SerialUSB.print(float(analogRead(A1)) / DIVIDER_V, 3);
SerialUSB.print("\t");
- SerialUSB.print(float(analogRead(A2))/DIVIDER_V, 3);
+ SerialUSB.print(float(analogRead(A2)) / DIVIDER_V, 3);
SerialUSB.print("\t");
- SerialUSB.println(float(analogRead(A3))/DIVIDER_V, 3);
+ SerialUSB.println(float(analogRead(A3)) / DIVIDER_V, 3);
break;
case 3: // Read and print all GPIO and DigINPUTs
@@ -191,11 +223,11 @@ void loop()
break;
case 4: // Read and Print Battery Voltage
- SerialUSB.println(float(analogRead(BATMON_PIN))/918, 3);
+ SerialUSB.println(float(analogRead(BATMON_PIN)) / 918, 3);
break;
case 5: // Read and Print internal Temperature
- SerialUSB.println(TempZero.readInternalTemperature());
+ SerialUSB.println(TempZero.readInternalTemperature());
break;
}
@@ -208,7 +240,7 @@ void loop()
inByte = SerialUSB.read();
SerialUSB.read();
- if(LoopState == 1)
+ if (LoopState == 1)
digitalWrite(BOOSTEN_PIN, LOW);
//else if(LoopState == 4)
// msTick = 500;
@@ -234,7 +266,7 @@ void loop()
break;
case 't':
SerialUSB.println("Searching for DS18B20-Sensors, connected to the four 1-Wire pins...");
-
+
SerialUSB.println("On-Chip Temperature in °C");
LoopState = 5;
break;
@@ -246,24 +278,24 @@ void loop()
default:
LoopState = 0;
PrintSR();
- break;
- }
+ break;
+ }
}
-/*
-delay(5000);
-rfm95.sleep();
-delay(5000);
-LowPower.deepSleep(10000);
-*/
+ /*
+ delay(5000);
+ rfm95.sleep();
+ delay(5000);
+ LowPower.deepSleep(10000);
+ */
}
-void PrintSR(){
+void PrintSR() {
// Status Report: Dumps a bunch of usefull information to SerialUSB
- // Toggle LED
+ // Toggle LED
digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
SerialUSB.println("**************************************");
@@ -290,20 +322,20 @@ void PrintSR(){
SerialUSB.println("********** ATSAMD21G18A MCU *********");
SerialUSB.print("Internal Temperature (°C): ");
- SerialUSB.println(TempZero.readInternalTemperature());
+ SerialUSB.println(TempZero.readInternalTemperature());
SerialUSB.print("Battery Voltage (V): ");
- SerialUSB.println(float(analogRead(BATMON_PIN))/918);
+ SerialUSB.println(float(analogRead(BATMON_PIN)) / 918);
- if(digitalRead(LED_BUILTIN))
+ if (digitalRead(LED_BUILTIN))
SerialUSB.println("Built-In LED ON");
else
SerialUSB.println("Built-In LED OFF");
-
- if(digitalRead(BOOSTEN_PIN))
+
+ if (digitalRead(BOOSTEN_PIN))
SerialUSB.println("LoopSupply ENABLED (12...15 V)");
else
SerialUSB.println("LoopSupply DISABLED");
-
+
SerialUSB.println();
SerialUSB.println("Send c, v, d, b or t to plot Analog and Digital readings.");
SerialUSB.println("Send s for 10 seconds of sleep mode.");
diff --git a/MultiNode/Configurator.py b/MultiNode/Configurator.py
index 7480d43..47412e2 100644
--- a/MultiNode/Configurator.py
+++ b/MultiNode/Configurator.py
@@ -36,7 +36,7 @@ client_address = 0x1234
server_address = 0x0001
# In ms
-sensor_update_interval = 3000
+sensor_update_interval = 5000
device_update_interval = 7000
jitter = 1000
diff --git a/MultiNode/MNLib.cpp b/MultiNode/MNLib.cpp
index 6034b97..eb79d64 100644
--- a/MultiNode/MNLib.cpp
+++ b/MultiNode/MNLib.cpp
@@ -2,6 +2,7 @@
#define FLASH_DEBUG 0
#define EEPROM_EMULATION_SIZE 1024
#include <FlashStorage_SAMD.h>
+#include <ArduinoLowPower.h>
MNConfiguration configuration;
RH_RF95 radio(RF_SS_PIN, RF_IRQ_PIN);
@@ -16,6 +17,9 @@ uint32_t last_server_message_id = 0;
//void init_mn(bool is_client = true)
void initMN()
{
+ if (batteryVoltage() < 3.5 && !USBDevice.connected()) // Shut off below this voltage, down to 3.1 V should be OK if the regulator has a dropout of 400 mV and conducts fully if its output is below 3.3 V
+ LowPower.deepSleep();
+
//_is_client = is_client;
EEPROM.setCommitASAP(false); // Don't unnecessarily write to the EEPROM
@@ -90,6 +94,7 @@ void initMN()
temperature_sensor.init();
initializeDevices();
+ initRTC();
}
void test()
@@ -266,6 +271,8 @@ bool send(uint8_t data[], uint8_t len)
bool success = true;
success = success & radio.send(full_data, 2 + 2 + 4 + 1 + len + HASH_LENGTH);
radio.waitPacketSent(); // What does the returned value here indicate?
+ radio.setModeIdle();
+ radio.sleep();
return success;
}
@@ -276,6 +283,8 @@ bool receive()
if (radio.recv(buffer, &len))
{
+ radio.setModeIdle();
+ radio.sleep();
uint16_t target_address = buffer[0] + ((uint16_t)buffer[1] << 8);
if ((target_address == configuration.client_address || target_address == 0xFFFF) && buffer[2] == (configuration.server_address & 0xFF) && buffer[3] == (configuration.server_address >> 8 & 0xFF))
{
@@ -344,9 +353,7 @@ DeviceBase* getDevice(uint8_t pointer)
device->pin = 0xFF;
}
else
- {
memcpy(reinterpret_cast<uint8_t*>(device) + 4, &configuration_memory[pointer], device->size());
- }
return device;
}
@@ -401,3 +408,41 @@ void sendDeviceData()
memcpy(&data[5], &temperature, 4);
send(data, 9);
}
+
+void initRTC() // https://github.com/arduino-libraries/RTCZero/blob/master/src/RTCZero.cpp
+{
+ PM->APBAMASK.reg |= PM_APBAMASK_RTC;
+#ifndef CRYSTALLESS
+ SYSCTRL->XOSC32K.reg = SYSCTRL_XOSC32K_ONDEMAND |
+ SYSCTRL_XOSC32K_RUNSTDBY |
+ SYSCTRL_XOSC32K_EN32K |
+ SYSCTRL_XOSC32K_XTALEN |
+ SYSCTRL_XOSC32K_STARTUP(6) |
+ SYSCTRL_XOSC32K_ENABLE;
+#endif
+
+ GCLK->GENDIV.reg = GCLK_GENDIV_ID(2) | GCLK_GENDIV_DIV(4);
+ while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
+#ifdef CRYSTALLESS
+ GCLK->GENCTRL.reg = (GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_OSCULP32K | GCLK_GENCTRL_ID(2) | GCLK_GENCTRL_DIVSEL );
+#else
+ GCLK->GENCTRL.reg = (GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_XOSC32K | GCLK_GENCTRL_ID(2) | GCLK_GENCTRL_DIVSEL );
+#endif
+ while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
+ GCLK->CLKCTRL.reg = (uint32_t)((GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK2 | (RTC_GCLK_ID << GCLK_CLKCTRL_ID_Pos)));
+ while (GCLK->STATUS.bit.SYNCBUSY);
+
+ RTC->MODE0.CTRL.reg &= ~RTC_MODE0_CTRL_ENABLE; // disable RTC
+
+ RTC->MODE0.CTRL.reg |= RTC_MODE0_CTRL_SWRST; // software reset
+
+ RTC->MODE0.CTRL.reg = RTC_MODE0_CTRL_PRESCALER_DIV1024 | RTC_MODE0_CTRL_MODE_COUNT32;
+ RTC->MODE0.CTRL.reg &= ~RTC_MODE0_CTRL_MATCHCLR; // disable clear on match
+
+ RTC->MODE0.CTRL.reg |= RTC_MODE0_CTRL_ENABLE; // enable RTC
+}
+
+uint32_t getRTC()
+{
+ return RTC->MODE1.COUNT.reg;
+}
diff --git a/MultiNode/MNLib.h b/MultiNode/MNLib.h
index 4bafcfc..ffb9586 100644
--- a/MultiNode/MNLib.h
+++ b/MultiNode/MNLib.h
@@ -189,4 +189,6 @@ void storeDevice(uint8_t pointer, DeviceBase* device); // Stores a device at the
void loopMN();
void sendSensorData();
void sendDeviceData();
+void initRTC();
+uint32_t getRTC();
#endif
diff --git a/MultiNode/MultiNode.ino b/MultiNode/MultiNode.ino
index 3e866da..1cc92a1 100644
--- a/MultiNode/MultiNode.ino
+++ b/MultiNode/MultiNode.ino
@@ -5,48 +5,39 @@
//#define IS_CLIENT
//#define IS_SERVER
-
unsigned long tick_tracker_sensors = 0;
unsigned long tick_tracker_device = 0;
unsigned long next_tick_sensors = 0;
unsigned long next_tick_device = 0;
-
-
-
-// Class to manage message delivery and receipt, using the rfm95 declared above
-//RHReliableDatagram rfManager(rfm95, CLIENT_ADDRESS);
-
-// Internal on-chip Temperature sensor
-
+unsigned long offset = 0;
void setup()
{
SerialUSB.begin(115200);
//while (!SerialUSB);
/*for (int i = 0; i < 5; i++)
- {
+ {
delay(1000);
SerialUSB.println("owo");
- }*/
+ }*/
initMN();
/*for (int i = 0; i < 2; i++)
- {
+ {
delay(1000);
SerialUSB.println("awa");
- }
- printStatusReport();*/
+ }
+ printStatusReport();*/
tick_tracker_sensors = millis();
tick_tracker_device = millis();
}
-
void loop()
{
if (SerialUSB.available())
{
size_t config_size = sizeof(MNConfiguration) - sizeof(configuration.client_secret_key) - sizeof(configuration.server_secret_key); // Don't leak the secret key
char command = SerialUSB.read();
-
+
switch (command)
{
case 'C': // Print configuration for in the field debugging
@@ -70,7 +61,7 @@ void loop()
SerialUSB.println(configuration.devices[i]);
if (configuration.devices[i] != 255)
{
- for(int j = 0; j < sizeof(AnalogInput); j++)
+ for (int j = 0; j < sizeof(AnalogInput); j++)
{
SerialUSB.print(reinterpret_cast<uint8_t*>(devices[i])[j]);
SerialUSB.print(" ");
@@ -79,15 +70,13 @@ void loop()
devices[i]->printStatus();
}
}
-
+
SerialUSB.println();
SerialUSB.print("Battery voltage: ");
SerialUSB.println(batteryVoltage());
-
- SerialUSB.println();
- SerialUSB.println(sizeof(uint16_t) + 1 * (sizeof(float) + sizeof(uint8_t) * 2));
- SerialUSB.println(sizeof(uint16_t));
- SerialUSB.println(1 * (sizeof(float) + sizeof(uint8_t) * 2));
+
+ SerialUSB.print("RTC time: ");
+ SerialUSB.println(RTC->MODE1.COUNT.reg);
SerialUSB.println("END");
break;
@@ -104,24 +93,24 @@ void loop()
SerialUSB.println(sizeof(AnalogInput) - 4);
SerialUSB.println("END");
break;
-
+
case 'r': // Read configuration (Frequency, which sensors etc.)
SerialUSB.write(reinterpret_cast<char*>(&configuration), config_size);
break;
case 'w':
- SerialUSB.readBytes(reinterpret_cast<char*>(&configuration), config_size);
+ SerialUSB.readBytes(reinterpret_cast<char*>(&configuration), config_size);
refreshConfig();
tick_tracker_sensors = millis();
tick_tracker_device = millis();
break;
-
+
case 'R': // Read configuration memory (extended configuration for each sensor)
SerialUSB.write(reinterpret_cast<char*>(&configuration_memory), sizeof(configuration_memory));
break;
case 'W':
- SerialUSB.readBytes(reinterpret_cast<char*>(&configuration_memory), sizeof(configuration_memory));
+ SerialUSB.readBytes(reinterpret_cast<char*>(&configuration_memory), sizeof(configuration_memory));
refreshConfig();
break;
@@ -129,7 +118,7 @@ void loop()
char data[sizeof(MNConfiguration)];
SerialUSB.readBytes(reinterpret_cast<char*>(&configuration) + config_size, sizeof(configuration.client_secret_key) + sizeof(configuration.server_secret_key));
SerialUSB.write(reinterpret_cast<char*>(&configuration) + config_size, sizeof(configuration.client_secret_key) + sizeof(configuration.server_secret_key));
-
+
refreshConfig();
break;
@@ -140,7 +129,9 @@ void loop()
loopMN();
- if (millis() >= next_tick_sensors)
+ long now_time = millis() + offset;
+
+ if (now_time >= next_tick_sensors)
{
sendSensorData();
tick_tracker_sensors = tick_tracker_sensors + configuration.sensor_update_interval;
@@ -150,7 +141,7 @@ void loop()
digitalWrite(LED_BUILTIN, LOW);
}
- if (millis() >= next_tick_device)
+ if (now_time >= next_tick_device)
{
sendDeviceData();
tick_tracker_device = tick_tracker_device + configuration.device_update_interval;
@@ -159,4 +150,25 @@ void loop()
delay(2);
digitalWrite(LED_BUILTIN, LOW);
}
+
+ long next_tick_device_dt = next_tick_device - now_time;
+ long next_tick_sensors_dt = next_tick_sensors - now_time;
+ long min_delay = min(next_tick_device_dt, next_tick_sensors_dt);
+
+ if (min_delay > 1000 && !USBDevice.connected())
+ {
+ power_sleep(min_delay);
+ offset += min_delay;
+ //USBDevice.init()
+ }
+}
+
+void power_sleep(uint32_t milliseconds)
+{
+ radio.setModeIdle();
+ //radio.sleep(); Doesn't work
+ setLoopPower(OFF);
+ LowPower.sleep(milliseconds);
+ radio.setModeIdle();
+ delay(100);
}
diff --git a/Readme.md b/Readme.md
index 26d5307..e5219db 100644
--- a/Readme.md
+++ b/Readme.md
@@ -1,18 +1,24 @@
Setup:
- Install SAMD boards in Arduino IDE
- Install Arduino Low Power
- Install TemperatureZero
- Install libraries from MultiNode/Libraries
- Upload MultiNode/MultiNode.ino
- Execute MultiNode/Configurator.py while it is attached
+ Install SAMD boards in Arduino IDE
+ Install Arduino Low Power
+ Install TemperatureZero
+ Install libraries from MultiNode/Libraries
+ Upload MultiNode/MultiNode.ino
+ Execute MultiNode/Configurator.py while it is attached
RasPi:
- # Install https://www.airspayce.com/mikem/bcm2835/ on Raspberry Pi (maybe not)
- sudo apt-get install pip
- pip install numpy pyLoraRFM9x pyblake2 toml
+ # Install https://www.airspayce.com/mikem/bcm2835/ on Raspberry Pi (maybe not)
+ sudo apt-get install pip
+ pip install numpy pyLoraRFM9x pyblake2 toml
- C++ programs need to be executed with sudo, or set permissions to use bcm2835 as user
+ C++ programs need to be executed with sudo, or set permissions to use bcm2835 as user
- Execute RasPi/RXTest.py
\ No newline at end of file
+ Execute RasPi/RXTest.py
+
+Reconfiguring a node:
+
+ Attach it via USB
+ Press the reset button (left of USB connector)
+ It will not enter sleep until it is unplugged
\ No newline at end of file