This is a tds sensor based on esp32-pico-d4 to be used for analyzing the status of a water purifier filters.
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- AC current generator to prevent polorization
- OLED screen
- Production ready
- ADS1115 for precise voltage readings.
- Temperature sensor for accurate tds calculation
- 2.4GHZ PCB Antenna
The pcb doesn't include a usb-ttl module hence you will need an external programmer like USB - TTL UART CP2102 or similar. H2 Header has the necessary pins for this purpose (3V3 GND RX TX).
You will need to order a probe with NTC 10k + electrodes. I've used: https://www.aliexpress.com/item/1005004315383393.html
Part of the schmatic design is based on: https://wiki.dfrobot.com/Gravity__Analog_TDS_Sensor___Meter_For_Arduino_SKU__SEN0244
The pcb includes headers for an 128x32 oled screen. I've used the following screen but you can use any oled screen with the same pinout. https://www.aliexpress.com/item/1005004900370420.html