sshoecraft/ac-sensorAC Sensor used in hydronic HVAC system
Ac sensor is an open-source printed circuit board by sshoecraft, from the sshoecraft/ac-sensor repository on GitHub. It is a 2-layer board of 80 × 30 mm with 24 parts on 17 nets, routed with 37 tracks and 3 vias.
It is built around the ESP32-C3-MINI-1, AMS1117-5.0 and TJA1050, with the RJ45-8P8C-D-11 among its other parts. Its parts include 6 connectors, 4 capacitors, 3 resistors, 3 ICs and 2 diodes. It belongs with the sensors and measurement boards and the ESP32 and RISC-V boards of this library.
This directory contains the complete KiCad design files for the ESP32-C3 CAN Bus + 4x JST sensor board.
| Component | Part Number | Package | Description |
|---|---|---|---|
| U1 | ESP32-C3-MINI-1 | QFN-32 | Main microcontroller |
| U2 | TJA1050 | SO-8 | CAN transceiver |
| U3 | AMS1117-5.0 | SOT-223 | 5V regulator |
| J1 | RJ45_8P8C | RJ45 | CAN Bus connector |
| J2 | Conn_01x04 | Pin header | Programming interface |
| J3-J6 | JST_PH_3pin | JST 2.0mm | Sensor input connectors |
Balanced placement on both sides for better cable management:
| Connector | ESP32 Pin | Position | Description |
|---|---|---|---|
| J3 | GPIO0 (D0) | Left Top | Sensor 1: VCC, GND, D0 |
| J4 | GPIO1 (D1) | Left Bottom | Sensor 2: VCC, GND, D1 |
| Connector | ESP32 Pin | Position | Description |
|---|---|---|---|
| J5 | GPIO2 (D2) | Right Top | Sensor 3: VCC, GND, D2 |
| J6 | GPIO3 (D3) | Right Bottom | Sensor 4: VCC, GND, D3 |
JST Pinout (each connector):
┌─────────────────────────────────────────────────────────────────────────────┐
│ [J3] [POWER] [ESP32-C3] [TJA1050] [RJ45] │
│ SENSOR1 5V CENTER CAN CAN │
│ D0 │
│ │
│ [J4] [J5] │
│ SENSOR2 SENSOR3 │
│ D1 D2 │
│ [RST][BOOT] [J6] │
│ SENSOR4 │
│ [PROG] D3 │
└─────────────────────────────────────────────────────────────────────────────┘
LEFT SIDE CENTER RIGHT SIDEBased on the actual prototype implementation:
| Function | ESP32 Pin | Connection | Description |
|---|---|---|---|
| CAN TX | GPIO6 (D6) | Direct → TJA1050 TXD | CAN transmit |
| CAN RX | GPIO7 (D7) | TJA1050 RXD → 10kΩ → GPIO7 | CAN receive with protection |
Protection: 10kΩ resistor on CAN RX line for input protection
| Pin | Signal | Description |
|---|---|---|
| 1 | +5VDC | Power input |
| 2 | GND | Ground |
| 3 | CAN-H | CAN Bus High |
| 4 | CAN-L | CAN Bus Low |
| 5-8 | Available | Future expansion |
| GPIO | Function | Connector | Position | Description |
|---|---|---|---|---|
| GPIO0 | D0 | J3 | Left Top | Sensor 1 digital input |
| GPIO1 | D1 | J4 | Left Bottom | Sensor 2 digital input |
| GPIO2 | D2 | J5 | Right Top | Sensor 3 digital input |
| GPIO3 | D3 | J6 | Right Bottom | Sensor 4 digital input |
| GPIO6 | CAN_TX | - | Internal | CAN transmit (D6) |
| GPIO7 | CAN_RX | - | Internal | CAN receive (D7) |
| GPIO9 | BOOT | SW2 | Bottom Left | Boot mode button |
| GPIO20 | UART_RX | J2 | Bottom Right | Programming RX |
| GPIO21 | UART_TX | J2 | Bottom Right | Programming TX |
The JST connectors are designed for digital sensors with these characteristics:
The 2-per-side JST layout provides several advantages:
The schematic and layout are based on analysis of the actual prototype boards, which clearly show:
This balanced JST placement is the optimal layout for professional sensor installations.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole_2.7mm_M2.5 | MountingHole:MountingHole_2.7mm_M2.5 | MH1, MH2, MH3, MH4 |
| 2 | 100nF | Capacitor_SMD:C_0805_2012Metric | C3, C4 |
| 2 | 330R | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 1 | 10K | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | 22uF | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | 470uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1 |
| 1 | AMS1117-5.0 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U3 |
| 1 | BOOT | Button_Switch_SMD:SW_SPST_B3U-1000P | SW1 |
| 1 | ESP32-C3-MINI-1 | RF_Module:ESP32-C3-MINI-1 | U1 |
| 1 | PWR_RED | LED_SMD:LED_0805_2012Metric | D1 |
| 1 | Programming | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | RESET | Button_Switch_SMD:SW_SPST_B3U-1000P | SW2 |
| 1 | RJ45_8P8C | Connector_RJ:RJ45_Amphenol_54602-x08_Horizontal | J1 |
| 1 | SENSOR_1_D0 | Connector_JST:JST_PH_B3B-PH-K_1x03_P2.00mm_Vertical | J3 |
| 1 | SENSOR_2_D1 | Connector_JST:JST_PH_B3B-PH-K_1x03_P2.00mm_Vertical | J4 |
| 1 | SENSOR_3_D2 | Connector_JST:JST_PH_B3B-PH-K_1x03_P2.00mm_Vertical | J5 |
| 1 | SENSOR_4_D3 | Connector_JST:JST_PH_B3B-PH-K_1x03_P2.00mm_Vertical | J6 |
| 1 | STS_GRN | LED_SMD:LED_0805_2012Metric | D2 |
| 1 | TJA1050 | Package_SO:SO-8_3.9x4.9mm_P1.27mm | U2 |
It measures 80 × 30 mm and has 2 copper layers, 1.6 mm thick.
24 parts, built around the ESP32-C3-MINI-1, AMS1117-5.0, TJA1050 and RJ45-8P8C-D-11. 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.
From the sshoecraft/ac-sensor repository on GitHub, at the commit this page was made from: the board is hardware/pcb.kicad_pcb and its schematic hardware/schematic.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask sshoecraft before reusing the design.
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