Stamp-C3U
SKU: C122-B
Description
Stamp-C3U is a cost-effective RISC-V minimal core board. It uses the Espressif ESP32-C3 as the main control chip, which features a RISC-V 32-bit single-core processor with a clock speed of up to 160 MHz. It comes with 400 KB SRAM + 4MB FLASH and integrates 2.4 GHz Wi-Fi. The core board supports security mechanisms such as secure boot, flash encryption, and digital signatures. Despite its compact size, it is highly functional and can meet diverse IoT application needs.
Features
- Supports multiple application forms (SMT, DIP, flying leads)
- Equipped with high-temperature plastic armor, supports SMT reflow temperature (230°C)
- Includes 5V->3.3V DC/DC circuit, GPIOx14
- TypeC interface
- Programmable RGB LED x1, reset button x1, button x1
- High-performance 3D antenna, providing stable and reliable wireless communication quality
- ESP32 minimal system board
Includes
- 5 x Stamp-C3U
- 5 x High-temperature resistant stickers
Applications
- DIY, prototyping
- Industrial automation
- Smart home
Specifications
| Main Control Resources | Parameters |
|---|---|
| ESP32-C3 | 32-bit RISC-V single-core processor, up to 160 MHz |
| Storage | 384KB ROM, 400KB SRAM, 8KB RTC SRAM, 4MB FLASH |
| Wi-Fi | 2.4 GHz band supports 20 MHz and 40 MHz bandwidth, IEEE 802.11 b/g/n protocol, up to 150 Mbps data rate |
| Input Voltage | 5V @ 500mA |
| Human-Machine Interface | Programmable physical button x1, reset/debug button x1, programmable RGB LED (SK6812) x1 |
| USB Interface | TypeC x1 |
| Antenna Type | 2.4G 3D antenna |
| Module Peripheral Resources | ADC, GPIO, SPI, UART, I2C, I2S, PWM, RMT, DMA, USB serial, TWAI |
| IO Interface x14 | G0, G1, G3, G4, G5, G6, G7, G8, G9, G10, G18, G19, G21, G22 |
| IO Interface Spacing | 2.54mm |
| Screw Specifications | M2 x 4 countersunk hexagon mechanical thread |
| Product Size | 34.0 x 20.0 x 4.6mm |
| Product Weight | 19.9g |
| Packaging Size | 138.0 x 93.0 x 5.6mm |
| Gross Weight | 22.8g |
Learn
Entering Program Download Mode:
1. Press and hold the center button (G9) on Stamp-C3U while power is off.
2. Connect to a computer, and after successfully identifying the port, proceed with program burning.
USB CDC Enable:
By default, USB CDC is disabled, and the serial output of C3U will be through UART0. If you need to output via USB, please enable the USB CDC option in the IDE before downloading the program. (Arduino users can enable it via Tools->USB CDC on Boot-Enabled, IDF users please refer to the ESP IDF official documentation.)
1. Press and hold the center button (G9) on Stamp-C3U while power is off.
2. Connect to a computer, and after successfully identifying the port, proceed with program burning.
USB CDC Enable:
By default, USB CDC is disabled, and the serial output of C3U will be through UART0. If you need to output via USB, please enable the USB CDC option in the IDE before downloading the program. (Arduino users can enable it via Tools->USB CDC on Boot-Enabled, IDF users please refer to the ESP IDF official documentation.)
Shell Supports Reflow Soldering Temperature Curve
Schematics
PinMap
SK6812, Button
| ESP32 | G2 | G9 |
|---|---|---|
| SK6812 | DI | / |
| Button | / | SW |
Model Size
PCB
Datasheets
Softwares
ESP-IDF
Video
Product Comparison
The difference between C3U and C3 is that Stamp-C3U has removed the USB download chip and instead uses the built-in USB Serial of ESP32-C3 for program downloading.
| Model | Main Control | IO Count | Button IO | USB Download Chip | USB Interface Function |
|---|---|---|---|---|---|
| Stamp-C3 | ESP32-C3 | 13 | G3 | CH9102 | Download / Serial |
| Stamp-C3U | ESP32-C3 | 14 | G9 | / | Download / JTAG / CDC Serial |
