Table of Contents

LamaPLC: HTU TE Connectivity temperature/humidity sensors with I²C communication

Type of measurement	Model	Power voltage	Measurement, range, accuracy	Communication	Note
Temperature Humidity	TE Connectivity HTU21	3.3V (1.5 .. 3.6V)	Temperature measurement range: -40 .. +125 °C Temperature measurement accuracy: ±0.3°C Humidity measurement range: 0..100% RH Humidity measurement accuracy: ±2%	I²C default addr.: 0x40 (fix)	Power Dissipation: 2.7 µW Resolution: 12 / 8 bit Measuring Time: 3..16 ms

Arduino

Arduino wiring

SCL: A5
GND: GND
SDA: A4
Vdd: 5V

Arduino code

sample

Example codes

none

I²C topics on lamaPLC

Page	Date	Tags
lamaPLC Communication: 1-Wire	2025/05/31 21:56	1-wire, communication, bus, microlan, i2c, uart, usart, ds18b20
lamaPLC Communication: I²C	2025/09/23 19:25	i2c, i c, smbus, philips, bus, communication, arduino
LamaPLC: AHT20 / BMP280 Modul	2025/10/10 08:37	bmp280, aht20, adafruit, temperature, humidity, pressure, sensor, arduino, code, i2c
LamaPLC: BMP/BME Bosch Temperature/Humidity/Pressure sensors with I²C communication	2026/02/08 21:45	bme280, bme680, bmp180, bmp280, bosch, temperature, humidity, pressure, sensor, arduino, i2c, communication
LamaPLC: DHT Temperature /Humidity sensors with 1-wire / I²C communication	2026/02/08 21:45	dht11, dht20, dht22, temperature, humidity, pressure, sensor, 1-wire, i2c, arduino, code
LamaPLC: DPS Infineon Temperature/Pressure sensors with I2C communication	2026/02/08 21:45	dps310, infineon, temperature, pressure, sensor, arduino, i2c, communication, code
lamaPLC: Energy, power, current, and voltage	2025/05/31 21:32	i2c, i c, communication, arduino, energy, power, current, sensor, ina226
LamaPLC: ENS ScioSense Multi-gas sensors with I²C communication	2026/02/08 21:45	ens160, sciosense, gas-quality, i2c, communication, sensor, arduino, code
lamaPLC: ESP32 / ESP8266	2025/11/21 23:07	esp8266, esp32, esp32-c2, esp32-c3, esp32-c5, esp32-c6, esp32-c61, esp32-h2, esp32-s2, esp32-s3, esp32-p4, espressif systems, communication, ethernet, ip, wi-fi, thread, zigbee, matter, homekit, bluetooth, mqtt, adc, spi, uart, i2c, i2s, rmt, pwm, usb, usb otg, twai
LamaPLC: Gas sensors	2023/07/01 15:29	gas, sensor, i2c, onewire, communication, mq-3, mq-4, mq-5, mq-6, mq-7, mq-8, mq-9, mq-135, gm-102b, gm-302b, gm-502b, gm-702b, alcohol, ch4, natural gas, smoke, lng, co, co2, lpg, h2, iso-butane, nox, nh3, benzene, town gas, formaldehyde, propane, humidity, temperature, voc, grv gas sens v2
LamaPLC: GY-9250 MPU-9250/6500 9-axis Attitude Sensor Board	2026/02/03 20:22	ak8963, gy-9250, mpu-9250, 9-axis, motion detection, magnetometer, communication, i c, i2c, spi
LamaPLC: HDC Texas Instruments Temperature/humidity sensors with I²C communication	2026/02/08 21:45	hdc1080, texas instruments, temperature, humidity, sensor, i2c, communication, arduino, code
lamaPLC: HT16K33 display controller	2025/11/22 21:26	i2c, 7-segment display, display, ht16k33, arduino
LamaPLC: HTU TE Connectivity temperature/humidity sensors with I²C communication	2026/02/08 21:45	htu21, te connectivity, temperature, humidity, i2c, communication, sensor, arduino, code
LamaPLC: Humidity/temperature / air-pressure / gas / air-quality sensors and modules for Arduino	2025/09/23 19:08	sht20, sht21, sht25, sht30, sht31, sht35, sht40, dht11, dht20, dht22, am2302, dps310, bme280, bme680, bmp180, bmp280, si7021, tc1047a, ds18b20, htu21, htu21d, gy21, gy68, gy bme280, scd30, modul, humidity, temperature, air-press, sensor, i2c, spi, modbus, onewire, communication
lamaPLC: LCD 1602/2004	2025/10/09 21:58	communication, i2c, display, lcd, 1602, 2004, hd44780
lamaPLC: MCP23017 / MCP23S17 16-Bit I/O Expander with Serial Interface	2025/12/04 00:34	communication, i2c, mcp23017, mcp23s17, spi, i o expander, serial, cjmcu-2317
LamaPLC: SGP Sensirion Gas-sensors with I²C communication	2026/02/08 21:45	sgp30, sgp40, sgp41, sensirion, gas-sensor, i2c, communication, sensor, arduino, code
LamaPLC: SHT Sensirion Temperature/humidity sensor with I²C communication	2026/02/08 21:45	sht20, sht21, sht25, sht30, sht31, sht35, sht40, gy21, temperature, humidity, i2c, communication, sensor, arduino, code
lamaPLC: Signal level converters	2025/11/22 19:12	pca9306, i2c, voltage, level, converter
lamaPLC: TCA9548A (HW617); Low-Voltage 8-Channel I²C Switch Module	2025/11/22 18:48	tca9548a, hw617, i2c, switch, communication, expansion board, arduino
lamaPLC: TM1637 7-segment display	2025/10/09 16:03	i2c, 7-segment display, display, tm1637, arduino
LamaPLC: TOFnnnC STMicroelectronics Time-of-Flight (ToF) sensors with I²C communication	2026/02/09 16:05	tof050c, vl6180, tof200c, vl53l0x, tof400c, vl53l1x, stmicroelectronics, time-of-flight, tof, i2c, communication, sensor, arduino, code
LamaPLC: VL53Lnn STMicroelectronics time-of-flight (ToF) laser-ranging sensors with I²C communication	2026/02/09 15:35	vl53l0x, vl53l1x, vl53l0 1xv2, gy-530, time-of-flight, tof, laser-ranging, i2c, communication, sensor, arduino, code
LamaPLC: VL6180X STMicroelectronics Time-of-Flight (ToF) sensor with I2C communication	2026/02/09 15:48	vl6180x, stmicroelectronics, time-of-flight, tof, i2c, communication, sensor, arduino, code
SSH1106/SSD1306 OLED Display with I²C communication	2026/02/06 16:40	i2c, oled, display, ssd1306, sh1106, ssh1106, arduino, cmos

HTU21, TE Connectivity, temperature, humidity, i2c, communication, sensor, arduino, code

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LamaPLC: HTU TE Connectivity temperature/humidity sensors with I²C communication

Arduino

Arduino wiring

Arduino code

Example codes

I²C topics on lamaPLC