Archive for the ‘I2C’ Category.

Multisensor LoRa Device

The described device is nearly matchbox-sized board (50 x 24 mm) packed with sensors. Auxilary board is 10x50mm with additional sensors. The module is developed around the Murata ABZ LoRa module, which integrates STM32L072 and samtech SX1276 in tiny 12.5 x 11.6 x 1.76 mm package. The main board is equipped with following sensors:

  • Magnetic compass MAG3110
  • Thermometer TMP75 for internal temperature measurements
  • MPU unit is MPU6050
  • RH and temperature sensor Si7013

Small section of the main board can be separated. There aqre 6 sensor on this part of the PCB:

  • Thermometer TMP75
  • RH sensor SHT31
  • RH, T and pressure sensor BME280
  • Another Si7013 for external RH and T measurement
  • Ambient light sensor VEML6030
  • UV sensor VEML6075

There are two 1Mbit EEPROMs on-board for local data logging. Additional pins are available for SPI, 2x UART and I2C interface, where even more sensors can be attached.

LoRa multisensor module

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LED shades

Light Emitting Dance shades – general purpose party accessory.

LED Shades v0.3

LED Shades v0.3

About this project

I believe many young adults like to party and with the rapidly growing EDM community a lot of people attend parties with electronic music. I am one of them and you can probably tell where I got the idea to make the LED shades. Projects like this one don’t just keep me occupied in my free time but are also designed to broaden my knowledge in electronics and programming. Continue reading ‘LED shades’ »

Ultra low cost I2C level shifter

I have some I2C sensors which are capable of running from low supply voltages. Host microcontroller has 3,3 or 5V supply, which is usually out of absolute maximum range, when I2C device is supplied with e.g. 1,8V. The sensor is usually very low power, which means simple emitter follower could do the low voltage supply.

The circuit schematic is shown in following drawing (click to enlarge):

sch

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