Wifi Pool thermometer for INTEX/Bestway Frame Pools

BOM List:

• 8 x M3x10 hexagon socket screws

• 8 x M3 nuts

• 2 x M4x25 hexagon socket screws

• 6 x M4x20 hexagon socket screws

• 8 x M4 nuts (normal nuts should work, but as mentioned in the comments, thinner nuts work better.)

• 1 x 2000mAh LiPo battery (https://www.amazon.de/gp/product/B08HD33ZKB/)

• 1 x 5V - 2.5 Watt PV modul (https://www.amazon.de/dp/B07BF7KX27)

• 1 x Arduino MKR 1010 (https://www.amazon.de/gp/product/B07FYFF5YZ/)

• 1 x Breadboard 88x55mm (You can also use a perforated grid board)

• 1 x Temperature sensor DS18B20 (https://www.amazon.de/gp/product/B07GZWMCBM/)

• 1 x 4.7k Ohm resistor

• Optional connectors for connecting the DS18B20 to the breadboard

• USB Cable for programming the Arduino

SOFTWARE:

• Arduino IDE

• Homeassistant to receive the temperature by an Hook (You can change the source code to receive the temperature in your prefered software)

How to build:

1. Print all the parts, except the two seal parts, from PETG (All parts can be printed on the PRUSA MINI) Be carefull: For some parts you have to insert a pause on certain layer hight to insert the nuts.

2. Print the seals from TPU95. (The seals are not really neccessary but would increase the protection against splashing water) 

3. Screw all parts together (M4 for sensor part, M3 for pv modul holder) but not the cover for the electronics.

4. While screwing the parts together thread the cable for the temperature sensor and the cable for the pv modul through the holes. Use tools if you are not able to thread the sensor cable through the cable path

5. Take the breadboard and build the circuit (Alternatively you can also solder the parts to a preforated grid borad)
   

   

6. You need to create two webhooks in your home assistant configuration. Please have a look at this page for how to do this: https://www.home-assistant.io/docs/automation/trigger/#webhook-trigger
   The Arduion sends the values to the address of the webhooks

7. Open Arduino IDE.

8. Modify the variables → char serverAdress, int port, char webhook and char batteryWebhook

9. Modify the wifi credentials in file “arduino_secrets.h”

10. Upload the sketch to your Arduino MKR Wifi 1010

11. Now you should fully charge the battery using the connected Arduion.

12. When fully charged you are good to go. :)

If you have any questions, please leave a comment. 

Buy me a coffee. :)