Ultra low power on Mini Ultra Pro (With Radio)

[Armel]

Hello,

I just ordered the Mini Ultra Pro for use in an ultra low power scenario, for which this boards seems like a perfect fit.
Would you have the example code that gets to a 20.0 μA current consumption in sleep mode?
By the way, thanks for creating the Low-Power library!
Best regards,

Armel

[Armel]

Hello,
I have un some power consumption tests using the LowPower and RadioHead/RH_RF95 libraries, but I can’t get below around 1mA in standby mode – around 50x more than I would expect.
See below my code, would you have some hints on how to get to the advertised 20uA ?
Thanks !

#include “LowPower.h”
#include <SPI.h>
#include <RH_RF95.h>

RH_RF95 rf95(5, 2); // Rocket Scream Mini Ultra Pro with the RFM95W

void setup()
{
// Rocket Scream Mini Ultra Pro with the RFM95W only:
// Ensure serial flash is not interfering with radio communication on SPI bus
pinMode(4, OUTPUT);
digitalWrite(4, HIGH);

rf95.init();
rf95.sleep();
LowPower.standby();
}

void loop()
{}

[Armel]

Hi,

In case someboy else has the same question, below is a very basic example that gets to around 20uA.
Hope this helps!

Armel

#include “LowPower.h”
#include <SPI.h>
#include <RH_RF95.h>
#define RF95_CS 5
#define RF95_RST 2
RH_RF95 rf95(RF95_CS, RF95_RST); // Rocket Scream Mini Ultra Pro with the RFM95W
#include <SerialFlash.h> // need to add Teensy 3s crc16.h in the SerialFlash/util folder (https://github.com/arduino/ArduinoCore-samd/issues/118)
#define FLASH_CS 4 // digital pin for flash chip CS pin

unsigned char count = 10;

void setup()
{
SerialUSB.println(“***** ATSAMD21 Standby Mode Example *****”);

// ***** IMPORTANT *****
// Delay is required to allow the USB interface to be active during
// sketch upload process
SerialUSB.println(“Entering standby mode in:”);
for (count; count > 0; count–)
{
SerialUSB.print(count);
SerialUSB.println(” s”);
delay(1000);
}
// *********************

rf95.init();
rf95.sleep();

pinMode(RF95_CS, INPUT_PULLUP); // required since RFM95W is also on the SPI bus
SerialFlash.begin(FLASH_CS);
SerialFlash.sleep();
}

void loop()
{
SerialUSB.println(“Entering standby mode.”);
SerialUSB.println(“Apply low signal to wake the processor.”);
SerialUSB.println(“Zzzz…”);

// might need to be more careful about which pins we are setting as output here…
for (byte i = 0; i <= 26; i++)
{
pinMode (i, OUTPUT);
digitalWrite (i, LOW);
} // end of for loop

// Detach USB interface
USBDevice.detach();
// Enter standby mode
LowPower.standby();
// Attach USB interface
USBDevice.attach();
// Wait for serial USB port to open
while(!SerialUSB);
// Serial USB is blazing fast, you might miss the messages
delay(1000);
SerialUSB.println(“Awake!”);
SerialUSB.println(“Send any character to enter standby mode again”);
// Wait for user response
while(!SerialUSB.available());
while(SerialUSB.available() > 0)
{
SerialUSB.read();
}
}

• This reply was modified 8 years ago by Armel.

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