Category,Item Name,Purpose,Estimated Cost (USD),Recommended Source / Note
Brain & UI,Arduino Uno R3 or ESP32 Development Board,Runs the software code
and PID algorithm,$5 - $15,Any electronics hobby retailer
Brain & UI,I2C 16x2 LCD Display Module,Visual readout for live temps and
system modes,$4 - $7,Look for pre-soldered I2C backpack version
Brain & UI,KY-040 Rotary Encoder Module,Dial interface to manually change
power/setpoints,$2 - $4,Includes a built-in tactile push button
Brain & UI,SPDT Toggle Switch (or Rocker Switch),Physical hardware switch to
toggle Manual/Auto mode,$1 - $2,Standard panel-mount switch
Power & Actuation,TEC1-12706 Thermoelectric Peltier Module,The active
solid-state heating and cooling pump,$4 - $6,Standard 40x40mm size module
Power & Actuation,IBT-2 BTS7960 High-Current H-Bridge Board,Reverses current
directions safely via PWM control,$7 - $12,Essential for dual heating/cooling
control
Power & Actuation,12V 10A DC Switching Power Supply,Supplies clean power to
Peltier element and driver,$15 - $25,Ensure it has built-in short circuit
protection
Sensors & Thermal,DS18B20 Waterproof Temperature Probe,Measures reaction block
temp with digital precision,$3 - $5,Stainless steel sheath version is ideal
for lab environments
Sensors & Thermal,Aluminum Stock CPU Cooler with 12V Fan,Dissipates heavy
waste heat from the Peltier plate,$8 - $15,Look for models matching standard
PC CPUs (Intel/AMD)
Sensors & Thermal,Small Aluminum Block or Pre-drilled Reactor Block,Holds
sample vials and transfers heat efficiently,$5 - $12,Can drill wells manually
into a solid aluminum block
Supplies & Tools,High-Thermal Conductivity Paste (TIM),Fills microscopic air
gaps between components for max heat transfer,$5 - $8,Brands like Arctic MX-4
or Noctua NT-H1 work perfectly
Supplies & Tools,4.7k Ohm Resistor (1/4 Watt),Acts as the mandatory pull-up
resistor for DS18B20 sensor,$0.10,Standard through-hole resistor
Supplies & Tools,Neoprene or EVA Insulation Tape,Prevents condensation
moisture and improves thermal efficiency,$3 - $5,Wrap around the aluminum
block edges
Supplies & Tools,Premium Breadboard & Solderless Jumper Wire Assortment,Tempora
ry prototyping connections without soldering,$5 - $10,Get a mix of
male-to-male and male-to-female wires
Supplies & Tools,Insulated Stranded Hookup Wire (14-16 AWG),Safe high-current
handling between Power Supply\, IBT-2\, and Peltier,$3 - $5,Do not use thin
breadboard wire for power lines