2 layers
Navigatorschema
maddevsio/mad-navigator
Mad navigator is simple compass-like device shows direction to predefined geo point. This repository contains firmware source code and schematics for device.
107 parts14
2 layers92.1 × 76.6 mm
Temperature controller
mayurdhang031/Digital-Temperature-controller-using-STM32-A PCB-based Digital Temperature Controller using STM32F103C8T6, LM35 sensor, 16x2 LCD, and Relay Driver designed in KiCad with Embedded C firmware.
- Size
- 92.1 × 76.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 53
- Pads
- 125
- Tracks, vias
- 345, 41
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 4 Aug 2026
- Updated
- 4 Aug 2026
Overview
Temperature controller is an open-source printed circuit board by mayurdhang031, from the mayurdhang031/Digital-Temperature-controller-using-STM32- repository on GitHub. It is a 2-layer board of 92.1 × 76.6 mm with 23 parts on 53 nets, routed with 345 tracks and 41 vias.
It is built around the AMS1117-3.3 and BC547. Its parts include 8 capacitors, 4 resistors, 3 ICs, 2 connectors and 2 switches. It belongs with the STM32 boards of this library.
Main components
2
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BC547
TO-92Bipolar (BJT)Jiangsu Changjing Electronics Technology (CJ)
README
README.mdDigital-Temperature-controller-using-STM32-
Overview
This project implements a Digital Temperature Controller using the STM32F103C8T6 microcontroller. The system measures ambient temperature using an LM35 temperature sensor, displays the measured temperature on a 16×2 LCD, and automatically controls a relay when the temperature exceeds a predefined threshold.
Features
- Temperature measurement using LM35
- 12-bit ADC of STM32
- 16×2 LCD display (4-bit mode)
- Automatic relay control
- BC547 transistor relay driver
- Flyback protection using 1N4007 diode
- Designed using KiCad 9
- Embedded C firmware
Hardware Used
- STM32F103C8T6
- LM35 Temperature Sensor
- 16×2 LCD
- AMS1117-3.3 Voltage Regulator
- BC547 NPN Transistor
- 5V Relay
- 1N4007 Diode
- 8 MHz Crystal
- Push Button
- Capacitors
- Resistors
Software Used
- KiCad 9
- Embedded C
Working Principle
- LM35 senses the ambient temperature.
- STM32 reads the analog voltage using its 12-bit ADC.
- Temperature is calculated in Embedded C.
- Temperature is displayed on the LCD.
- If the temperature exceeds the predefined threshold, the relay is activated.
- When the temperature falls below the threshold, the relay is deactivated.
Project Images
- Schematic
- PCB Layout
- 3D PCB View
Future Improvements
- User-adjustable temperature setpoint
- Buzzer alarm
- UART monitoring
- Bluetooth/Wi-Fi connectivity
- Data logging
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C3, C4, C5, C6 |
| 3 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3 |
| 2 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1, C2 |
| 2 | 22pF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C7, C8 |
| 1 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | BC547 | Package_TO_SOT_THT:TO-92_Inline | Q1 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | Conn_01x02_Pin | TerminalBlock:TerminalBlock_bornier-2_P5.08mm | J2 |
| 1 | Crystal | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | G5LE-1 | Relay_THT:Relay_SPDT_Omron-G5LE-1 | K2 |
| 1 | RC1602A | Display:RC1602A | U3 |
| 1 | R_Potentiometer | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV1 |
| 1 | STM32F103C8Tx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U1 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
Questions
How big is the Temperature controller PCB?
It measures 92.1 × 76.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Temperature controller use?
23 parts, built around the AMS1117-3.3 and BC547. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Temperature controller KiCad files?
From the mayurdhang031/Digital-Temperature-controller-using-STM32- repository on GitHub, at the commit this page was made from: the board is temperature controller.kicad_pcb and its schematic temperature controller.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Temperature controller design in my own project?
Its repository states no licence, so its author keeps all rights: ask mayurdhang031 before reusing the design.
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