Hi out there.
I'm coming from web dev background and I'm kinda newbie on electronics world. Here I will try to explain my first "big" project and I would like to read your suggestions/ideas/corrections.
So I want to build something that might sound simple and maybe it is. I want a controller to control a Peltier element, a fan and a temperature sensor. Since I have a background on web dev, I thought to choose as my controller a raspberryPi-zero. Install linux and build a web interface that will cooperate with some python code to control the previously mentioned elements. The user will have access to the web app through a WiFi AP( access point) that RP zero will serve.
Through this web app, a user should be able to set some kind of configuration on what temperatures and for how long the Peltier should develop. For example one could configure the following:
1 - Ramp up to 65 C and stay @ 65 for 20 min
2 - Ramp up to 95 C stay @ 95 C for 10 min
3 - Ramp down to 20 C and stop
What Peltier is going to warm and cold is a small volume (around 100 to 500 microliters) of liquids.
So far through my search, I ended up to the following construction (see picture below) and the corresponding element list. As I told you I'm kinda a newbie and the following might be completely wrong. But please be patient with me
Here is how I imagine the whole schematics
and here is the list of the elements
#1 16V power supply
**broken link removed**
#2 5V 1A regulator
https://www.dimensionengineering.com/products/de-sw050
#3 Raspberry Pi / Zero W
#4 Raspberry Pi relay
https://www.adafruit.com/product/3352
#5 H-bridge
**broken link removed**
#6 Peltier
https://gr.rsdelivers.com/product/a...eltier-module-162w-28a-157v-30-x-30mm/4901430
#7 Temp Sensor
https://www.ebay.com/itm/5PCS-DALLA...187157?hash=item20fbe73555:g:niUAAOSwNSxVUwed
#8 Fan
https://www.ebay.com/itm/40mm-DC-5V...341761&hash=item2a711938b7:g:R3cAAOSwOyJX3zzx
As you can see I tried to use only one power supply for the whole project as also I added and an H-bridge to reverse the polarity of the Peltier.
Any idea and suggestion on element selection or schematic are welcome.
Thanks.
P.S I would like to test the whole project without any PID controller at first.