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If you wish to add humidity and temperature sensors to your private home automation sensor, you may \u2014 like [Maker\u2019s Fun Duck] did \u2014 purchase some generic ones for a couple of buck. For a greenback, you get a little bit sq. LCD with sensors and a button. You even get the battery. Are you able to reprogram the firmware to bend it to your will<\/a>? As [Duck] exhibits within the video beneath, you may.<\/p>\n The system advertises some customized BLE companies, however [Duck] didn\u2019t wish to use the seller\u2019s telephone app, so he cracked the case open. Inside was a microcontroller with Bluetooth, an LCD driver, a sensor IC, and little or no else.<\/p>\n The processor is an ARM Cortex M0, a PHY6222 with very low energy consumption. The LCD is a really low cost panel with no drivers onboard. All of the drive electronics are on the PCB. The sensor is a CHT8305C which makes use of I2C.<\/p>\n Fortunately, the PHY6222 has a publically accessible SDK with English documentation. The PCB has two units of UART pads and it’s attainable to flash the chip through one of many UARTs.<\/p>\n Finally, [Duck] put a customized firmware on the field, however we had been intrigued by the concept for a buck you could possibly get a little bit low-power ARM module with an LCD and a sensor. It looks as if you could possibly do extra with this, though we’re certain the LCD is just not very normal goal, absolutely this little field may act as a panel meter, a countdown timer, or plenty of different issues with some customized firmware.<\/p>\n These are, after all, knock offs of the marginally dearer Xiaomi sensors, and people are flashable<\/a>, too. We aren\u2019t certain how correct both sensor is, however humidity measurement<\/a> is a posh matter.<\/p>\n