One usually pays about 3-6€ for a sensor. I wouldn’t want to wait another month to get replacements. Of course, I ordered multiples of each type in case I burned one of them. It takes about a month for the sensors to arrive, but they tend to have the cheapest offers. Where to buy the sensors? I decided to look to eBay and its countless Chinese sellers. MLX90416 to measure the temperature (IR) of objects -70 to 300 degrees Celsius (like those contactless thermometers).Mics6417 to measure eight more gases and their concentration.CCS811 to measure CO2 and VOC gas concentrations.VEML6075 for UV measurement (UVA, UVB => UV Index).VEML6040 for LIGHT measurement (RGB, LUX).VL53L0X for distance measurement (0-120cm).BME280 for ambient pressure, temperature, and humidity.BNO055 for orientation (roll, pitch, yaw) and acceleration.After some googling I ended up choosing these: Now I had to figure out which sensors work with I2C. With the ESP32, I2C can be mapped to almost any IO pin. Three of them are power, one is not connected and some are for SPI (which would interfere with the performance of the display).Īt least two of the pins-GIO15 and GPIO4-were not used by anything else. The ODROID-GO has an expansion header with 10 Pins. Now was the time to embark on such a project. I’ve had an idea for a multisensory device for quite a while. Then Hardkernel popped up with the ODROID-GO-the perfect combination for me. What I never had was a good combination of those things, packaged together in a nice case with a battery. I also had projects that used displays and buttons for visualization and control. I had already done projects involving sensors (i.e. After awhile, I found the ESP32 (WROOM32) for my projects. My journey continued, and I discovered the coolness of Espressif’s ESP8266. One day, I discovered the ATMEL AVR programmable series. I began with circuits based on standard TTL and CMOS logic chips. For those of you who do not know what a Tricorder is, allow me to explain: In the newer Star Trek series, characters often carry a mobile device used for things like measuring rips in the space-time continuum and declaring “He’s dead, Jim.”Īlthough I earn my money by dealing in software, I have always had an affinity for hardware: wiring chips and other digital components together.
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