blakeclewis / blakes_garage

blakes_garage

A Radiant floor heating project for my garage. I installed radiant floor heat in the garage years ago. I am createing the control system to monitor the system and eventially take control of it.

Parts

• Raspberry pi Zero W
• 6 - DS18b20 one-wire temperature sensor water proof - Amazon
• 2 - ACS758LCB 50A Range Linear Current Sensor module - Amazon
• 2 - 3V 1 channel relay module - Amazon
• 1 - Adafruit Pro Bonnet pcb
• 1 - mcp3008 8 ch, 10bit ADC w/ SPI interface - Adafruit 856
• 1 - 2x8 DIP IC chip socket
• 4 - 3x4 right angle male header - Adafruit 816
• 1 - OLED display 128x64 - Adafruit 3527

Temp sensors

• outside air (oa)
• inside air (ia)
• hot water (hw)
• return 1 (r1)
• return 2 (r2)
• mix valve (mx)

Current sensors

• Aquastat 1 (A1)
• Aquastat 2 (A2)

relay

• water pump

2 stage project

• data acquisition and fail safe failure mode: gas water water heater standing pilot goes out, system still tries to heat floor. This stage will log 6 temperatures and system state changes.
• system control This stage will remove the auastats and replace them with relays

water pipe schematic

hw________________mx__pump___loop1__aquastat1__valve1_
|                  |       |_loop2__aquastat2__valve2_| 
|_<<oneway-valve<<_|__________________________________|

electric control schematics

• existing

120Vac_________________________________________________
             |                                         |
pi__3Vdc-relay___48V-trans___aquastat1__valve1___P-relay__pump
                           |_aquastat2__valve2___|

• remove aquastats

120Vac_________________________________
       |                               |
       |_48V-trans__                   |
                    |                  |
          pi__3v-relay__valve1___P-relay__pump
            |_3v-relay__valve2___|

Valve(1,2) use a material that expands when heated with an electric element, which pushes a valve open. When the valve opens (it is not fast) it make a connection energizing the pump. The Aquastats have a 5°C temp range(min/max). It energizes the valve at min, and closes the valve at max. The dials on the Aqustat do not have numbers and are course adjustments. I am going to replace the aqustats with temp sensor and relays, Relays will open the valves and valves will energize the pump. Valves and pump replay are 48VAC, pump is 120VAC,