My dry box has been broken. Unfortunately, I can't find controller spare to renew. So, I try to use Arduino Pro Mini to replace its controller MCU.
How to do?
1. Understand how dry box works: Maker use cooler plate to condensate water in the box, then water will be taken out by osmotic material.
2. Try to read current PCB, then take out old MCU
3. Soldering cable from PCB to connect to Arduino Pro Mini
4. Write program to control cooler plate, receive SV %RH, show %RH and *C, turn on lighting

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Code and Ciruit
https://bit.ly/3inFZkv

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Part to make (in case you want to make dry box DIY)
1. Arduino Pro Mini https://amzn.to/2xy4yFn
2. Cooler plate https://amzn.to/3EHKSBU
3. Humid sensor https://amzn.to/3eQGP6V
4. PCB
5. Button
6. 7-Segment

Part to purchase (dry box - complete set)
https://amzn.to/31BAOqZ

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Other meaning project made by me:
1. Shadow light box http://bit.ly/2rtcrMN

2. DIY Portable infrared thermometer http://bit.ly/2M0NOhx

3. Temperature indicator http://bit.ly/2E5EhBl

4. How to program OLED screen http://bit.ly/2E7Q5mH

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