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    M5StickC: turn off screen completely

    M5 Stick/StickC
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    • D
      dda
      last edited by

      To be tested but I think this turns off OLED_VDD, ie the current to the OLED. Register 10H is said to be for OLED_VPP so setting it to zero could help too.

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      • D
        dda
        last edited by

        I did a simple test: with only REG 28H the screen stays slightly warm. With both 28H and 10H, the screen cools off after a while. Hardly a scientific test, I know, but seems to point to the need to set both registers.

        W K 2 Replies Last reply Reply Quote 0
        • W
          ws1088 @dda
          last edited by

          @dda what a wonderful work you have done! I hope this will enable @Multihelix to use M5StickC as a watch (turn off OLED after a timeout and turn on OLED on button press or accelerometer)

          D 1 Reply Last reply Reply Quote 1
          • M
            maxstack @Multihelix
            last edited by

            @multihelix

            How are you getting 5 hours of life? it seems you would need <16 ma total drain

            Are you sleeping the ESP32?

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            • D
              dda @ws1088
              last edited by

              @ws1088 Funny enough I bought my M5StickC with the watch strap and all, but not because I wanted a watch – I don't wear them – but because it enables me to tie it up to my backpack when I do LoRa range tests :-)

              W 1 Reply Last reply Reply Quote 0
              • W
                ws1088 @dda
                last edited by

                @dda said in M5StickC: turn off screen completely:

                @ws1088 Funny enough I bought my M5StickC with the watch strap and all, but not because I wanted a watch – I don't wear them – but because it enables me to tie it up to my backpack when I do LoRa range tests :-)

                why would you use m5stickc to do LoRa range tests? You can get LoRa chip with OLED screen. Do you connect m5stickc to a LoRa chip via I2C? or WiFi AP?

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                • D
                  dda
                  last edited by

                  I have a lot of different LoRa chips and setups. I have one board, at 230 MHz, that I can connect through the hat connector (I need 3 pins + Vcc/GND). I have transceivers, both at 230 and 433 MHz, I connect to via RS485 (I bought a hat for that, and also some RS485 for my M5Stack cores). etc etc. The smaller the better :-)

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                  • M
                    Multihelix @maxstack
                    last edited by

                    @maxstack - Yes, I used ESP DeepSleep set to wake on Button A being pressed, but I would say that the 5 hour time was not under ideal conditions, as I occasionally woke up the device to confirm it was still working and to check the time - a resonable activity for a watch.

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                    • S
                      spiffmonious @Multihelix
                      last edited by

                      @multihelix Can you post a link to your watch code?

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                      • K
                        klimbot @dda
                        last edited by klimbot

                        @dda said in M5StickC: turn off screen completely:

                        I did a simple test: with only REG 28H the screen stays slightly warm. With both 28H and 10H, the screen cools off after a while. Hardly a scientific test, I know, but seems to point to the need to set both registers.

                        I'm looking at this thread to hopefully implement a complete screen turn off, but am not sure what register mask to use (based on quoted post)

                        Here is what I have, the screen is off but hard to know if the screen has actually been disabled.

                        void turnOffScreen() {
                        Wire1.beginTransmission(0x34);
                        Wire1.write(0x10);
                        Wire1.write(0b00000000); // 7-3=? | 2=EXTEN | 1=? | 0=DC-DC2
                        Wire1.endTransmission();

                        Wire1.begin(21, 22);
                        Wire1.beginTransmission(0x34);
                        Wire1.write(0x12);
                        Wire1.write(0b01001011); // 7=? | 6=EXTEN | 5=? | 4=DC-DC2 | 3=LDO3 | 2=LDO2 | 1=DC-DC3 | 0=DC-DC1
                        Wire1.endTransmission();

                        Wire1.beginTransmission(0x34);
                        Wire1.write(0x28);
                        Wire1.write(0b00001111); // 7-4=LDO2 | 3-0=LDO3
                        Wire1.endTransmission();
                        }

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                        • F
                          ForestRupicolous
                          last edited by ForestRupicolous

                          @klimbot: I think you have to turn LDO3 and LDO2 off, in your code only LDO2 is off. Take a look at this picture: https://docs.m5stack.com/assets/img/product_pics/core/minicore/m5stickc/m5stickc_05.webp

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                          • V
                            viandou
                            last edited by

                            This is how I init my M5StickC in a full black screen way.

                            M5.begin(0,1,1);
                            M5.Axp.SetLDO2(false);
                            M5.Axp.SetLDO3(false);
                            
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