@percramer you have to use a value just below the motors stall value. To make a motor hard stop you perposely stall the motor however, you have to stall and release the motor as soon as it stops or current will ramp up and possibly damage components.

[image: 1588440740547-ee786342-3a78-4376-8f4a-93135008524f-image-resized.png] Hi, I am using the nb-iot module with m5stack. The program is https://github.com/m5stack/M5-ProductExampleCodes/blob/master/Module/NB_IOT/Arduino/NB_IOT.ino But I can't understand the mistake. Can someone help me?

Do you want to program the goplus in arduino or uiflow? there is a uiflow example on the docs page https://docs.m5stack.com/#/en/module/goplus if you wish to use arduino please check out this video https://www.youtube.com/watch?v=V8rmir-Tmy8 and substitute ir pin with gpio 13

I look forward to hearing about your hacking ideas. Best of luck :)

Currently one does not exist please contact M5Stack directly using this page https://m5stack.com/pages/contact-us The modules connect via SPI. this page may help you build a compatable US version https://docs.m5stack.com/#/en/module/lora

@sheepdog said in flash m5stack fisheyes camera ov2640: Which esp-idf version did you use? You can get the Version with: $ git describe In the begining with esp-idf v4.2 And with esp-idf 3.3 realease can't finish "build" Adding ESP-IDF tools to PATH... Not using an unsupported version of tool xtensa-esp32-elf found in PATH: esp-2020r1-8.2.0. Not using an unsupported version of tool cmake found in PATH: 3.16.4. Not using an unsupported version of tool openocd-esp32 found in PATH: v0.10.0-esp32-20200406. Not using an unsupported version of tool ninja found in PATH: 1.10.0. C:\Users\oxyrace.espressif\tools\xtensa-esp32-elf\1.22.0-80-g6c4433a5-5.2.0\xtensa-esp32-elf\bin C:\Users\oxyrace.espressif\tools\esp32ulp-elf\2.28.51.20170517\esp32ulp-elf-binutils\bin C:\Users\oxyrace.espressif\tools\cmake\3.13.4\bin C:\Users\oxyrace.espressif\tools\openocd-esp32\v0.10.0-esp32-20190313\openocd-esp32\bin C:\Users\oxyrace.espressif\tools\mconf\v4.6.0.0-idf-20190628 C:\Users\oxyrace.espressif\tools\ninja\1.9.0 C:\Users\oxyrace.espressif\tools\idf-exe\1.0.1 C:\Users\oxyrace.espressif\tools\ccache\3.7 C:\Users\oxyrace.espressif\python_env\idf3.3_py3.8_env\Scripts [836/837] Linking CXX executable camera.elf FAILED: camera.elf cmd.exe /C "cd . && C:\Users\oxyrace.espressif\tools\xtensa-esp32-elf\1.22.0-80-g6c4433a5-5.2.0\xtensa-esp32-elf\bin\xtensa-esp32-elf-g++.exe -mlongcalls -nostdlib @CMakeFiles\camera.elf.rsp -o camera.elf && cd ." esp-idf/main/libmain.a(main.c.obj):(.literal.app_main+0x18): undefined reference to led_brightness' esp-idf/main/libmain.a(main.c.obj): In function app_main': D:\ESP32\esp-idf\examples\m5stack\wifi\wifi_sta\build/../main/main.c:89: undefined reference to `led_brightness' collect2.exe: error: ld returned 1 exit status ninja: build stopped: subcommand failed. ninja failed with exit code 1

I cant be 100% over this but it looks to be stock old firmware. I broke mine this week so been researching how to build a new one using updated firmware and TMC2209 drivers.

@jnicol actually , our screen supplier test data, the screen, allow max brightness 853nit. maybe you could modifying the program, the display effect in the sun will be improved

@jirivanerka Those Pin provided user to design electronic circuit. so default they not connect anything. you can solder they connect to anywhere.

I can't make it work with a USB-C to USB-C cable either (running on a MacBook Pro 16' with Catalina). Using a USB-C to USB-A hub works....

That did the trick. Thank you

@cepics Is feasible, but we have not done any example in this regard

@lukasmaximus said in m5stack + sim800l: Hi @Nicolaf899 I cannot help you here as I was not able to get the sim800l working myself, please refer to the recent topic http://forum.m5stack.com/topic/1785/sim800l-gprs-mqtt I pasted some links there with information about sim800l. Where possible please check if there is a discussion going on about this module and ask your questions there instead of duplicating a thread, thanks okk thank you

Same here, I can get a connection to the network, but no ping or anything. Did you get it to work @Procrasto ? I see the unit is out of stock on the M5 store and can not find anybody on the net with a success story... Could it be this unit is not capable of working in europe?

I have the same problems. My experience: AT+CFUN=1 +CREG: 2 +CGREG: 2 OK +CEREG: 2 +CGEV: ME PDN ACT 1 +CREG: 1 ^MODE: 17,10 +CREG: 1 +CEN1: 1,204 +CEREG: 1 +CIREPI: 0 +CNEMS1: 0 at+cops=? +COPS: (2,"T-Mobile NL","T-Mobile NL","20416",7,1),,(0-4),(0-2) OK AT+IPSTART=1,"TCP","185.78.197.71",3000 +CME ERROR: 30 I too get +CME ERROR: 30 on all ping actions. The sim is ok, I get data when I use it in a smartphone. Is anybody out there successfully transmitting data with this unit? any help would be greatly appreciated!