Temperature + Humidity Sensor HS3003

The HS3003, manufactured by Renesas, is one of the most precise environment sensors for temperature and humidity. It is contained in the PLUG-AND-MAKE kit offered by ARDUINO. But as it is 5-volts tolerant, it can also be used with standard Arduinos. To use the Modulino part you have to connect it via a Qwiic adapter cable. In order to display its data on a simple I2C display (that responds to all addresses from 1 to 127) an Arduino clone using the 328PB that offers even Wire1, was used. Unfortunately, the HS300x library could not be persuaded to accept Wire1, so all the library code had to be included in the sketch. When I tried to provide power to LED module using the ICSP header the next surprise was met: on the JOY-IT clone, the ICSP pins were rotated by 180 degrees compared to the standard Arduino UNO.

All the three parts, the Arduino, the sensor and the display were mounted on a base board designed in the look of the PLUG-AND-MAKE kit.