@iamliubo Thank you.

@m5stack How can I get bin file from the device?

I hear a whisper that M5Stack have been listening and are working on a new version.

@stantheman You don't need to check anything, just configure spi for lower speed. There is not much sense in using fast spi clock with LoRa module, 1 MHz is probably enough. BTW, there are some LoRa modules which operates over serial port (UART) which are quite easy to use (like this one or this one). LoRa-E5 (STM32WLE5JC) Module is also very interesting and supports LoRaWAN too.

Ok, here is the simple program I came up with using the TinyGPS++ library. Hopefully It will help someone else who comes across this same problem. I still don't know what I can do to access the correct GROOVE port since the M5 base is for Core2, but at least I have a temp solution to keep developing my project. The complete program below works on my Core Gray with pins connecting my AT6550 to 5v, gnd, 16 and 17 on the core. This uses lat, long and speed on a simple display that is easy to read. #include <M5Stack.h> #include <TinyGPS++.h> static const uint32_t GPSBaud = 9600; TinyGPSPlus gps; HardwareSerial ss(2); void setup() { M5.begin(); M5.Power.begin(); ss.begin(GPSBaud, SERIAL_8N1, 16, 17); M5.Lcd.setTextSize(4); M5.Lcd.setCursor(40,10); M5.Lcd.println("Simple GPS"); M5.Lcd.println("_____________"); } void loop() { while (ss.available() > 0) gps.encode(ss.read()); M5.Lcd.setTextSize(3); M5.Lcd.setCursor(0,100); M5.Lcd.printf("Lat: "); M5.Lcd.setCursor(100,100); M5.Lcd.print(gps.location.lat(), 6); M5.Lcd.setCursor(0,150); M5.Lcd.printf("Lon: "); M5.Lcd.setCursor(100,150); M5.Lcd.print(gps.location.lng(), 6); M5.Lcd.setCursor(0,200); M5.Lcd.printf("MPH "); M5.Lcd.setCursor(100,200); M5.Lcd.print(gps.speed.mph()); }

Hello guys from the schematic there should be no difference whether you power M5Atom via 5V on the Groove connector or the 5 V pin in the back. Measuring for continuity between Groove and the respective pins in the back also shows they are connected 1:1 and are the same. Running a simple sketch on my M5Atom Matrix, which only connects WiFi and is showing that by changing the LEDs from red to green, I see that working ok with voltages from 2.8 V to 5.2 V. BTW: I am getting the same results with an M5Atom Lite. Thanks Felix

@m5stack What is current fw build based on ? I mean version of mainstream micropy? Thanks

Send the message as a string. If you want to send a list, cast it to a string, then use eval() in the receiver.

There is aM5StickPlus library !! Thanks a lot!

@felmue Thank you for the help, I might try it.

I use this code in stickc as esp receiver for debug. And on other atom lite i use only broadcast datablock with convert to str block with my message. And its works.

I mistaking posted this in core2, but wanted to chime back in as I have it working. Still not sure how to get the right port with my gray but if someone finds this I wanted to link the solution. https://127.0.0.1:6060/topic/3217/hardwareserial-ss-2-uart-connection-on-16-17-for-a-gps-antenna

For my particular project I have a 8 digital IO that I am trying to connect and therefore would like to use the PbHub connected to the M5StickC to expand the IO (as they advertise). I also have the weight module which works fine if I connect this directly to the M5StickC grove port. So now I must choose between using a PbHub or a Weigh module. I had thought it possible to add the weigh module to one of the ports on the PbHub however after experimenting with different pin combinations for initializing the HX711 scale i.e. HX711 scale(33, 32); // This works when the weigh unit is connected to the grove port on the M5StickC // Below are the other combinations I tried for passing the necessary pins to the HX711 through the Mega328 without any success. //HX711 scale(porthub.hub_d_read_value_B(4), porthub.hub_d_read_value_A(4)); HX711 scale(porthub.hub_a_read_value(4), 32); //HX711 scale(porthub.hub_d_read_value_A(4), 32); //HX711 scale(porthub.hub_d_read_value_B(4), porthub.hub_d_read_value_A(4)); //HX711 scale(porthub.hub_d_read_value_A(4), porthub.hub_d_read_value_B(4)); Unfortunately, I think @felmue is right. The Mega328 isn't able to forward the clock required by the HX711 chip.

let me show what we did: we use the CCI ISOBUS Stack, written in C, https://github.com/Meisterschulen-am-Ostbahnhof-Munchen/Install-ISOBUS-Environment/wiki ISOBUS makes GUI Communication ECU <--> Display over CAN, and much more for Smart Agriculture, which seems to be one of the Focus Topics of M5. i am a Teacher at School, and i want to Teach it in UIFlow instead of C, because easier to learn.

Danke @felmue , Your answer pointed me in the right direction. The voltage between GND and BAT pins was indeed 4.0V+, so I went back to check my code. I noticed that the official documentation for the AXP on the M5StickC only mentions M5.Axp.GetVbatData() (which is what I used and what gave me weird readings) but the AXP code example uses M5.Axp.GetBatVoltage() and the latter actually gives me the correct number. What's the difference between these two? Is it just the *1.1/1000? Cheers, Flo

@ajb2k3 Hi. Yeah using the UHF blocks and have got UHF tags whose ISO matches that of the reader.

Thanks, I made it work since. ☮

If the M5 firmware is close to the upstream MicroPython, you can: import gc gc.mem_free() And it will print the available free memeory gc.collect() Will run the memory garbage collection to free up memory that is no longer being used. You can gc.collect() somewhere in your main loop to make sure memory is kept tidy. See the gc module page for more information https://docs.micropython.org/en/latest/library/gc.html?highlight=gc#module-gc

Hello @felmue , Thanks for your response, Yes, I also saw this Schematic and that's why thought to confirm from M5Stack before proceeding. Thanks Sameer