概述

经典款是有ch343 ttl 转usb 需要安装驱动 GPIO20/21

新款使用usb 直连不需要驱动 USB GPIO18/19

ESP32C3 是ESP-RISC-V CPU 是基于 RISC-V ISA 的 32 位内核，包括基本整数 (I)，乘法/除法 (M) 和压缩 (C) 标准扩展。ESP-RISC-V CPU 内核具有 4 级有序标量流水线，针对面积、功耗、性能等进行了优化.

硬件资源

ESP32C3 160MHz, 320KB RAM, 4MB Flash (4MB Flash 为外置，可自己更换）

I2C 可以使用任意管脚

I2S 可以使用任意管脚

IR 可以使用任意管脚

//2 uart   uart0 下载
#define    UART1_TX_PIN  0
#define    UART1_RX_PIN  1//5 12bit adc  采样率 100k sps
#define    ADC0_PIN  0
#define    ADC1_PIN  1
#define    ADC2_PIN  2
#define    ADC3_PIN  3
#define    ADC4_PIN  4// one  spi  支持主模式
#define   SPI_CK_PIN    2
#define   SPI_MOSI_PIN  3
#define   SPI_MISO_PIN  10
#define   SPI_CS_PIN    7//（最大同时4路）4路pwm 任意gpio 0 1 12 18 19 13 2 3 10 6 7 11 5 4 8 9
//1 iic
#define   I2C_SCL_PIN 5
#define   I2C_SDA_PIN 4
#define   LED1_PIN 12
#define   LED2_PIN 13
#define   BOOT_PIN 9

ESP32-C3FN4 和 ESP32-C3FH4 中的内置 flash 端口与芯片管脚对应关系为：

• CS# = SPICS0

• IO0/DI = SPID

• IO1/DO = SPIQ

• CLK = SPICLK

• IO2/WP# = SPIWP

• IO3/HOLD# = SPIHD

以上管脚不建议用于其他功能

详细硬件资料参考官网文档

platformio 配置

选择esp32-c3-devkitm-1开发板 flash mode选择dio

[env:esp32-c3-devkitm-1]
platform = espressif32
board = esp32-c3-devkitm-1
framework = arduino
board_build.flash_mode = dio
upload_port = COM8
lib_deps = dfrobot/DFRobot_PAJ7620U2@^1.0.1

这里使用PAJ7628 手势识别模块作为demo 进行测试

通过Wire 指定I2C 管脚地址

#include <Arduino.h>
#include "C3_PIN.h"
#include <DFRobot_PAJ7620U2.h>
DFRobot_PAJ7620U2 paj;void setup()
{Serial.begin(115200);while (!Serial);Wire.setPins(I2C_SDA_PIN,I2C_SCL_PIN);while (paj.begin() != 0){Serial.println("initial PAJ7620U2 failure!");delay(500);}Serial.println("PAJ7620U2 setup ok");/*Set fast detection mode*If the parameter is set to false, the module enters slow detection mode, and itdetects one gesture every 2s. We have integrated*some gestures inside the module to make it convenient for beginners.*The slow mode can recognize 9 basic gestures and 4 expanded gestures: move left,right, up, down, forward, backward, clockwise,*counter-clockwise, wave, slowly move left and right, slowly move up and down,slowly move forward and backward,*wave slowly and randomly.****If the parameter is set to true, the module enters fast detection mode.*The fast mode can recognize 9 gestures: move left, right, up, down, forward,backward, clockwise, counter-clockwise, wave*To detect the combination of these gestures, like wave left, right and leftquickly, users needs to design their own algorithms logic.*Since users only use limited gestures in this mode, we are not going to integratetoo much expanded gestures in the library.*If necessary, you can complete the algorithm logic in the ino file by yourself.*/paj.setGestureHighRate(true);pinMode(LED1_PIN, OUTPUT);pinMode(LED2_PIN, OUTPUT);
}
void loop()
{DFRobot_PAJ7620U2::eGesture_t gesture = paj.getGesture();if(gesture != paj.eGestureNone ){/* Get the string descritpion corresponding to the gesture number.* The string description could be* "None","Right","Left", "Up", "Down", "Forward", "Backward", "Clockwise", "Anti-Clockwise", "Wave",* "WaveSlowlyDisorder", "WaveSlowlyLeftRight", "WaveSlowlyUpDown","WaveSlowlyForwardBackward"*/String description = paj.gestureDescription(gesture);//Convert gesture number into string descriptionSerial.println("--------------Gesture Recognition System---------------------------");Serial.print("gesture code = ");Serial.println(gesture);Serial.print("gesture description = ");Serial.println(description);Serial.println();}
}

实际效果