This is a temperature monitor for water filled environments, the waterproof sensor is the only thing that will go into the water, and all the control equipment sits next to it, on dry land has relay support (and associated safety stuff, like making sure 240v can’t get water on) in order to provide a on / off function. and a new heater because i can’t turn off the old one or it will kill my fish as this project is going to manage the heating of my tank aswell as measuring temperature. I need the usb cable sto power the three Pico’s that power it. (2 to measure temperature, and one to manage the screen / relay)


I am going to assemble this onto a breadboard first to check my logic works. and then i will order a custom PCB from JLCPCB to assemble it more pernamently my steps will be approximatly:

  1. assemble the 240v power switching relay (day —smth— (depends on when the guy who agreed to help me is around))
  2. place pico and display onto breadboard and wire it up (day 1)
  3. get the pico outputting “hello world” to the display (day 1)
  4. attach the temperature sensor (day 1)
  5. build the software to measure from the sensor and output to the display (day 2 - 4)
  6. test deploy (day 4)
  7. get pico sending data to adafruit IO (day 5)
  8. buy and design PCB (day 6)
  9. build PCB (day 8)
  10. deploy (day 8)


Jumper Jerkyhttps://shop.pimoroni.com/products/jumper-jerky?variant=304798331$3.05
Breadboard (830 point)https://shop.pimoroni.com/products/solderless-breadboard-830-point?variant=402722409$19.95
2 x (1 x 16) pin headerhttps://shop.pimoroni.com/products/0-100-2-54-mm-female-header-straight?variant=31533818740819$2.44
2 x (1 x 12) pin headerhttps://shop.pimoroni.com/products/0-100-2-54-mm-female-header-straight?variant=31533817954387$1.83
Featherwing oledhttps://shop.pimoroni.com/products/adafruit-featherwing-oled-128x64-oled-add-on-for-feather-stemma-qt-qwiic?variant=32206315028563$14.95
RPI pico Whttps://shop.pimoroni.com/products/raspberry-pi-pico-w?variant=40454061752403$7.32
12 x (1 x 10) pin headerhttps://shop.pimoroni.com/products/0-100-2-54-mm-female-header-straight?variant=39351739383891$3.66
Waterproof 1-Wire DS18B20 Digital temperature sensorhttps://www.adafruit.com/product/381$9.95
2 x (1 x 3) pin headerhttps://shop.pimoroni.com/products/0-100-2-54-mm-female-header-straight?variant=31533815201875$0.61
PCBordered from JLCPCBEstimated at $10 without shipping etc
Soldering Iron kit (I don’t own most of this stuff, and my iron recently broke)https://www.amazon.co.uk/Soldering-Multimeter-Desoldering-Stripper-Tweezers/dp/B08KVYD7DK/ref=sr_1_10?keywords=soldering+iron&qid=1672140601&sr=8-10&th=1&currency=USD$29.03
Screw Terminal Blockshttps://shop.pimoroni.com/products/screw-terminal-block-3-pin-5-mm-pitch-side-entry-4-pack?variant=39351758684243$1.51
Adafruit power relayhttps://shop.pimoroni.com/products/adafruit-power-relay-featherwing?variant=28175389319$9.69
3 x USB 2.0 Micro usb cablehttps://www.amazon.co.uk/gp/product/B0711PVX6Z/ref=ox_sc_act_title_1?smid=A3P5ROKL5A1OLE&psc=1$5.54
3 Pin USB plughttps://www.amazon.co.uk/gp/product/B08R3Z3BRL/ref=ox_sc_act_title_2?smid=AK045812498PA&psc=1$5.98
4 Port USB hubhttps://www.amazon.co.uk/gp/product/B01DYD3Q28/ref=ox_sc_act_title_3?smid=A3P5ROKL5A1OLE&psc=1$7.23
1 Way extension leadhttps://www.amazon.co.uk/gp/product/B09B6MYFL8/ref=ox_sc_act_title_4?smid=A2MQR4D9E14LS4&psc=1$13.27
Jewel automatic heaterhttps://www.amazon.co.uk/gp/product/B0030HJY5C/ref=ox_sc_act_title_5?smid=A2MYEVYTNLKQFQ&psc=1$34.95
Nylon cable glandshttps://www.amazon.co.uk/gp/product/B07WHBZ1ZS/ref=ox_sc_act_title_6?smid=A3P5ROKL5A1OLE&psc=1$7.12
Double weatherproof power sockethttps://www.amazon.co.uk/gp/product/B082KZ1JPP/ref=ox_sc_act_title_7?smid=A3P81ISNL53U0E&psc=1$12.68
3 x New 1 x 20 headers…https://thepihut.com/products/female-header-set-for-raspberry-pi-pico$6
Total with shipping or taxes$252.02

Will try to get the sensor from pimoroni, if it is back in stock by time of ordering