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BigClown "Sensor adapter" versatile expansion board for sensors from ebay and aliexpressPrint

BigClown, popular IoT platform, offers a lot of TAGs (board with sensor) and modules, but I still had missed versatile board for connection of cheap sensors from ebay and aliexpress - e.g. BMP280, Si7021 or SHT31.

Why use cheap sensors when BigClown offers really quality and accurate sensors? Because if you want to start with this platform, you have to buy Core module. It is main part which you need and then you buy some expansion boards like battery module, TAGs (sensors) and others.

The starting price is higher than we are used to. So, I designed "Sensor adapter" for BigClown which decrease the starting price of your developing.

The price for Core module starts from 19 EUR (11/2018) without wireless interface, 29 EUR (11/2018) with 868/433 MHz.



The "Sensor adapter" is really easy board and there isn't some soldering problem.
There are three 4pins header for sensors, connectors for connection to BigClown board, blocking capacitors for each sensor, pull-up resistors for SDA and SCL, two soldering bridge for choice of I2C (I2C0 and I2C1).

Recommended value of resistors R1 and R2 is 4k7 (0805 size). The minimum value of resistors is 3.3 kOhm.
The value of blocking capacitors is 100nF (0805 size).

Schematic of v0.2 and v0.3



PCB of v0.2 and v0.3



And what sensors can you connect to Sensor adapter?
The main conditions are power voltage (3.3V) and the same pinout. Version 0.2 doesn't includes INT pin, it is pin of sensor module which may be used for interrupt, alarm etc. This pin can be connected to GPIO PA8 and PA9 by soldering bridge.



There is list of more than ten sensors which are compatible with pinout and votlage.
Some of sensors were not tested. Some sensors are tested and example code is attached with description of sensor.

The schematic, PCB and example codes are available on https://github.com/petus/BigClown_sensor_adapter

List of sensors

The sensor of temperature, humidity and pressure - BME280


Source: https://www.ebay.com/itm/BME280-Pressure-Temperature-Sensor-Module-Breakout-IIC-I2C-for-Arduino-DIYmall/281745479989?epid=1448372052

IR thermometer - MLX90614


Source: https://www.amazon.com/Digital-Infrared-Temperature-MLX90615-GY-90615/dp/B01M4FNRJE

Sensor of temperature and humidity - SHT31


Source: https://www.ebay.com/itm/SHT31-SHT31-D-Temperature-Humidity-Sensor-I2C-Breakout-Weather-for-Arduino/152155016191

Sensor of light, proximity - APDS-9930 (INT output is not connected)


Source: https://www.ebay.com/itm/APDS-9930-GY-9930-LLC-Proximity-Attitude-I2C-ALS-RGB-Sensor-For-Arduino/401448137518

Sensor of light, proximity - APDS-9960 (INT output is not connected)


Source: https://www.ebay.com/itm/1PCS-Gesture-Sensor-Module-I2C-and-GY-9960LLC-APDS-9960-Breakout-for-Arduino-S/172431330948

Sensor of light - BH1750 (ADDR input is not connected)


Source: https://github.com/Erriez/ErriezBH1750

Sensor of temperature and pressure - BMP180
Example code: https://github.com/petus/BigClown_sensor_adapter/tree/master/examples/BMP180_temperature


Source: https://www.ebay.com/itm/BME280-Pressure-Temperature-Sensor-Module-Breakout-IIC-I2C-for-Arduino-DIYmall/281745479989?epid=1448372052

Sensor of temperature and pressure - BMP280


Source: https://www.aliexpress.com/item/Atmospheric-Humidity-Temperature-Sensor-Breakout-Barometric-Pressure-BMP280-SI7021-for-Arduino-GY-21P/32800606530.html

Tri-axis accelerometer - MAG3110 (INT output is not connected)


Source: https://www.ebay.com/itm/GY-3110-MAG3110-3-Axis-Magnetometer-Sensor-Module-for-Arduino-I2C-Breakout-SR/283182122525

IR thermometer - MLX90615


Source: https://www.amazon.com/Digital-Infrared-Temperature-MLX90615-GY-90615/dp/B01M4FNRJE

Sensor of temperature and humidity - Si7021
Example code: https://github.com/petus/BigClown_sensor_adapter/tree/master/Si7021_temperature


Source: https://www.banggood.com/cs/GY-21-HTU21D-Humidity-Sensor-With-I2C-Interface-For-Arduino-Industrial-High-Precision-p-1184749.html

Light sensor - TSL2561 (INT output is not connected)


Source: https://www.ebay.com/itm/TSL2561-Digital-Luminosity-Lux-Light-Sensor-Breakout-Arduino-I2C-5v-3v-US/292634437210

Color sensor - VEML6040


Source: https://www.techonicsltd.com/product/veml6040-rgbw-color-sensor-breakout-i2c/

Color sensor - VEML6070 (ACK output is not connected)


Source: https://www.aliexpress.com/item/Free-shipping-UV-sensor-module-VEML6070-UV-Sensitivity-Detection-Sensor-for-Arduino/32683340584.html
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