HeaterMeter V3.1 PCB
The HeaterMeter V3.1 PCB is identified by the silkscreen on the back reading "LinkMeter V3.1" or from the top by the 74LS164 14 pin DIP shift register.
- Schematic Image
- EAGLE 5 schematic and board
- External Connections probes/LCD
- Button Board
- DorkBot cam job or cam output. Use cam output if you just want a board made with no modifications
- README description of files
- ZIP containing all the above
| Qty | Value | Device | Parts | Link |
|---|---|---|---|---|
| 1 | ATmega328P | AVR-MEGA8-PPTH | IC2 | Mouser |
| 1 | 74LS164N | 74LS164N | IC1 | Mouser |
| 1 | 16Mz | RESONATOR-PTH | Y1 | Mouser |
| 1 | 0 | R-US_0204/7 | R7 | AKA a wire |
| 1 | 390 | R-US_0204/7 | BTN-R7 | Mouser |
| 1 | 680 | R-US_0204/7 | BTN-R8 | Mouser |
| 5 | 1k | R-US_0204/7 | R1, R3, R4, R15, R19 | Mouser |
| 3 | 2.2k | R-US_0204/7 | R8, R9, BTN-R9 | Mouser |
| 6 | 4.7k | R-US_0204/7 | R2, R13, R22, R23, R24, BTN-R11 | Mouser |
| 5 | 10k | R-US_0204/7 | R20, R21, R25, R26, R27 | Use %1 below |
| 4 | 10k 1% | R-US_0204/7 | R5, R16, R17, R18 | Mouser |
| 1 | 10k | TRIM_US-CT6 | R6 | Mouser |
| 1 | 10k | THERMISTOR_R-2,5 | TR1 | Mouser |
| 1 | 0.01u | C-US025-025X050 | C7 | Mouser |
| 5 | 0.1u | C-US025-025X050 | C2, C3, C6, C9, C10 | Mouser |
| 1 | 22u/6.3 | CPOL-USE2.5-6 | C8 | Mouser |
| 1 | 22u/25 | CPOL-USE2.5-6 | C1 | Mouser |
| 1 | 47u/10 | CPOL-USE2.5-6 | C5 | Mouser |
| 1 | 47u/25 | CPOL-USE2.5-6 | C4 | Mouser |
| 3 | 1N4001 | DIODE-DO41-7 | D1, D2, D3 | Mouser |
| 1 | 1N5817 | DIODE-DO41-7 | D4 | Mouser |
| 1 | IRL510 | PMOSFET_NTO220BV | Q1 | Mouser |
| 1 | RESET | TAC_SWITCHPTH | S1 | Mouser |
| 1 | TACTILE-4 | TACTILE-4 | S2 | Mouser |
| 1 | BC337 | BC337 | Q2 | Mouser |
| 1 | 7805 | 7805TV | Q3 | Mouser |
| 1 | MCP1700-33 | MCP1700TRI | Q4 | Mouser |
| 1 | GRN | LED3MM | LED1 | Mouser |
| 1 | RFM12B | RFM12B | U$1 | ModernDevice |
| 1 | LCD_16X2 | TUXGR_16X2_R2 | DIS1 | Mouser |
| Qty | Device | Parts | Link |
|---|---|---|---|
| 1 | Male PINHD single row | J1(LCD), J2(PROBE), J3(BTN), J4(BLW), J8(FTDI) | Mouser 0.23" mate/0.12" tail/15u gold |
| 2 | CONHOUSE single row 6-pin | P1(LCD 2x) | Pololu |
| 1 | CONHOUSE single row 5-pin | P2(PROBE) | Pololu |
| 2 | CONHOUSE single row 2-pin | P3(BTN),P4(BLW) | Pololu |
| 1 | Female PINHD 1X6/90 | P5(RTR) | DigiKey |
| 1 | Male PINHD 2x3 | J6(ICSP) | Mouser |
| 1 | Male PINHD single row/90 | J7(POW), PX5(RTR External) | Mouser |
| 1 | Crimp pins female x100 | N/A | Pololu |
| 1 | 2.1mm POWER_JACKPTH | J9(POW) | Mouser |
| 4 | Mono 2.5mm female jack | JP3(PIT), JP4(FOOD1), JP5(FOOD2), JP6(FOOD3/AMB) | Mouser |
| 1 | RCA Female jack | JX4(BLOWER External) | Mouser |
| Qty | Description | Link |
|---|---|---|
| 1 | Blower-style fan 12VDC 5-10CFM | DigiKey |
| 1-4 | Maverick BBQ Thermistor Probes (3ft or High Heat) | Maverick |
Mouser Project for all Mouser parts listed above $31.68
To use wireless probes, a RFM12B receiver needs to be added to the design. These parts are included in the list above. The default code assumes a 915MHz transceiver, which is only legal in the United States, but a one-line code change facilitates using 433MHz or 868MHz bands to comply with other local regulations. In the Standalone HeaterMeter configuration, an additional 3.3V power supply needs to be added to power the transceiver. The 3.3V regulator is not needed in the HM4LM configuration.
If you do not wish to have wireless probe support you can omit a large number of parts: R22 through R27, U$1, Q4, C8 and C9. R15 and LED1 are also optional but recommended for debugging purposes because LED1 is blinked once before initialization and once after.
(A HeaterMeter HM4LM on a v3.1 PCB with no RF installed, showing what does not need to be populated)