Posts made by Bram

So, the 4.6V is consistent with the schematic for the Stamp-S3, I see.

The EN is connected to VIN, not VCC, via a diode, which drops it a little below the 5V from USB.

This is different from the Stamp-C3, but I guess that's fine.

@mtylerjr Thank you for that great diagnosis!

I checked, and yes, I had a short.

I fixed it, and hopefully I will not see the 0.5A power draw any more. I still have the 4.6V on EN pin, though, which I think is weird.

What is the EN pin supposed to be?

On my ESP32C3 I measure VCC (3.3V)

But on my ESP32S3 I measure 4.6V (with a 3.30V VCC, and 5.01V USB power.)

The latter I find very strange?

@mtylerjr Yes, I soldered the 2.54mm headers. I will check them again under my microscope.

I also see a weird 4.6V on EN pin, whereas the VCC is a perfect 3.30V and the power is a 5.01V.

My Stamp-S3 seems to work fine, but regularly starts to suddenly draw 500mA for no apparent reason.

This makes the unit too hot to touch.

Even if I disconnect ALL pins, it still keeps drawing 500mA from the USB port.
Only after unplugging, and reconnecting to USB, the powerdraw goes back to normal, at 10mA or so.

Has anyone else seen the Stamp-S3 turn extremely hot at random times?

@salty_good

My name is Abraham Stolk, I am an indie game-developer from Vancouver, Canada, who turned electronics-maker.

My latest product is the Desk-side Stock Ticker.

It is a tiled-panel of 4 OLED displays that are used to scroll stock quotes on.

By default, it will scroll the stock quotes from the DOW-30 Index. But you can configure the symbols to use, over wifi.

The stock quotes are downloaded from the Internet, with a 3 minute refresh.

To connect it to your WiFi network, you use the WPS button of your home router. It was really easy to get going, thanks to the WPS example in the Arduino IDE.

I programmed it in C, using Arduino IDE.

It runs on either Stamp-C3 or Stamp-C3U.

I love the white-look of the Stamp-C3U: it is the best looking μcontroller in existence, I think. Although the black Stamp-C3 is a little easier to program, as you do not have to force it in bootloader mode the first time you use it.

Overall, I am a big fan of your μcontroller boards.

The production process was prototyping on a breadboard to validate the design. Once it worked, I designed a PCB in EasyEDA, and had JLCPCB manufacture the PCBs. Assembly was done in my home-lab.

I am particularly proud of how I managed to take cheap 1.3" OLEDs and tile them into a 140mm aggregate screen. Thanks to the fast SPI interfacing, I get high FPS out of it.

It appears that ENABLE is indeed the RESET pin. I use it to connect SPI OLED RESET signals, and that works.

Does Stamp C3 have a RESET pin? (I know it has a reset button, but it the RESET signal broken out on the header?)

The espressif ESP32-C3-DevKitM-1 has RESET on pin 7.

I did see a pin ENABLE on the StampC3... is that the same as RESET? Or its inverse?

Thanks.

I have been using ARDUINO_ESP32C3_DEV to differentiate between Espressif dev board and StampC3, in combination with ESP_PLATFORM.

I used a Stamp-C3 RISCV controller to make a CO₂ monitor.

It has a knob to zoom in/out on the time series data.

It has a very satisfying control mechanism.

@ajb2k3 said in Preprocessor defines for STAMP-C:

@bram the stamp Pico uses the esp32 Pico D3 the Stamp C uses the ESP32 C3 which is a RiscV processor

Yes, I know that.

It works fine. But I want a preprocessor define to conditionally compile code.

Hello,

When I write my code (in Arduino IDE) I like to be able to differentiate between microcontroller targets.

To check for a Arduino Pro Micro, I use: if defined(ARDUINO_AVR_MICRO) e.g.

For an Adafruit Trinket M0: if defined(ARDUINO_TRINKET_M0) can be used.

I tried to determine what I could use for M5STACK STAMP-C.
But I have been unable to find out what I could use.
Normally, when I toggle verbose compiler output, I can find a symbol.
But for a stamp-c compile, I just get:

/home/bram/.arduino15/packages/m5stack/tools/riscv32-esp-elf-gcc/gcc8_4_0-esp-2021r2/bin/riscv32-esp-elf-g++ -DHAVE_CONFIG_H "-DMBEDTLS_CONFIG_FILE=\"mbedtls/esp_config.h\"" -DUNITY_INCLUDE_CONFIG_H -DWITH_POSIX -D_GNU_SOURCE "-DIDF_VER=\"v4.4-beta1-189-ga79dc75f0a\"" -DESP_PLATFORM -D_POSIX_READER_WRITER_LOCKS -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/config -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/newlib/platform_include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/freertos/include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/freertos/include/esp_additions/freertos -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/freertos/port/riscv/include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/freertos/include/esp_additions -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp_hw_support/include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp_hw_support/include/soc -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp_hw_support/include/soc/esp32c3 -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp_hw_support/port/esp32c3 -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp_hw_support/port/esp32c3/private_include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/heap/include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/log/include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/lwip/include/apps 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-I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/idf_test/include/esp32c3 -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/jsmn/include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/json/cJSON -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/libsodium/libsodium/src/libsodium/include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/libsodium/port_include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/mqtt/esp-mqtt/include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/openssl/include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/spiffs/include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/wifi_provisioning/include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp_littlefs/src -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp_littlefs/include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp-face/include -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp-face/include/tool -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp-face/include/typedef -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp-face/include/image -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp-face/include/math -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp-face/include/nn -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp-face/include/layer -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp-face/include/detect -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/esp-face/include/model_zoo -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/tools/sdk/esp32c3/include/fb_gfx/include -march=rv32imc -ffunction-sections -fdata-sections -Wno-error=unused-function -Wno-error=unused-variable -Wno-error=deprecated-declarations -Wno-unused-parameter -Wno-sign-compare -ggdb -Wno-error=format= -nostartfiles -Wno-format -Os -freorder-blocks -fstrict-volatile-bitfields -Wno-error=unused-but-set-variable -fno-jump-tables -fno-tree-switch-conversion -std=gnu++11 -fno-exceptions -fno-rtti -c -w -x c++ -E -CC -DF_CPU=160000000L -DARDUINO=10820 -DARDUINO_STAMP_C3 -DARDUINO_ARCH_ESP32 "-DARDUINO_BOARD=\"STAMP_C3\"" "-DARDUINO_VARIANT=\"m5stack_stamp_c3\"" -DARDUINO_PARTITION_default -DESP32 -DCORE_DEBUG_LEVEL=0 -DARDUINO_HW_CDC_ON_BOOT=0 @/home/bram/Arduino/builds/build_opt.h -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/cores/esp32 -I/home/bram/.arduino15/packages/m5stack/hardware/esp32/2.0.2/variants/m5stack_stamp_c3 /home/bram/Arduino/builds/sketch/stamptest.ino.cpp -o /dev/null

I cannot use ESP_PLATFORM, as that is too generic.

Also, esp_config.h does not contain board identifiers.

Anyone here knows what should be used for conditional compiles on STAMP-C?

Thanks!

Am I correct in that Stamp-C3 uses GPIO 0/1 for SDA/SCL?

I saw it labelled as "Port-A." Does that refer to I2C?

If it is not the default I2C, could I make it the I2C pins by doing this in the Arduino IDE?

# define I2CSDA 0
# define I2CSCL 1
...
Wire.begin(I2CSDA, I2CSCL);