Add ESP32-C3 board w/ I2C OLED 0.42" (#15)

Author: jandelgado

README.md

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+../.common/Makefile

esp32_c3_oled_0.42/Makefile

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+/*
+ * demo for tiny ESP32-C3 board with 0.42" OLED display using u8glib2.
+ * The OLED is connected to I²C pins 5 (SDA) and 6 (SCL).
+ * The on-board LED is connected to pin 8 and low-active.
+ */
+
+#include "U8g2lib.h"
+#include "jled.h"
+#include <Wire.h>
+#include <driver/temp_sensor.h>
+
+#define SDA_PIN 5
+#define SCL_PIN 6
+
+U8G2_SH1106_72X40_WISE_F_HW_I2C u8g2(U8G2_R0, U8X8_PIN_NONE);
+auto led = JLed(8).Breathe(4000).MinBrightness(20).LowActive().Forever();
+
+void setup(void) {
+ // initialize I²C
+ Wire.begin(SDA_PIN, SCL_PIN);
+ u8g2.begin();
+
+ // Initialize temperature sensor
+ temp_sensor_config_t temp_sensor = {
+ .dac_offset = TSENS_DAC_DEFAULT,
+ .clk_div = 6,
+ };
+ temp_sensor_set_config(temp_sensor);
+ temp_sensor_start();
+}
+
+void loop(void) {
+ static long last_update = 0;
+
+ if (millis() - last_update > 1000) {
+ u8g2.firstPage();
+ do {
+ float temp;
+ temp_sensor_read_celsius(&temp);
+
+ u8g2.setFont(u8g2_font_torussansbold8_8r);
+ u8g2.drawFrame(0, 0, 72, 40);
+ u8g2.drawStr(2, 10, "Hello");
+ u8g2.drawStr(2, 18, "ESP32-C3");
+ u8g2.drawStr(2, 26, (String("T=") + String(temp, 1)).c_str());
+ u8g2.drawStr(2, 34, (String(last_update / 1000)).c_str());
+
+ } while (u8g2.nextPage());
+ last_update = millis();
+ }
+
+ led.Update();
+ delay(1);
+}

esp32_c3_oled_0.42/esp32_c3_oled.ino

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+[platformio]
+default_envs = esp32c3
+src_dir = .
+
+[env:esp32c3]
+platform = espressif32
+board = esp32-c3-devkitm-1
+framework = arduino
+lib_deps=olikraus/U8g2@2.36.2
+ jandelgado/JLed@4.15.0