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HeaterMeter 4.2 Hardware
As a reminder, HeaterMeter refers to the ATmega (Arduino) based microcontroller board that runs the LCD, reads button and temperature probe inputs, and controls the servo and blower motor. This document describes the configurations and design of the HeaterMeter board, which may optionally be attached to a Raspberry Pi.
Standard HeaterMeter hardware is built on a HeaterMeter v4.2 PCB
- Surface Mount a PCB with the optional thermocouple parts already soldered and tested or the HeaterMeter kit
- Buy direct from OSH Park (minimum quantity 3), singles OSH Park or HeaterMeter
- Schematic Image
- EAGLE 5 schematic and board
- DorkBot/OSH Park cam job or cam output. Use cam output if you just want a board made with no modifications
HeaterMeter can be built either as a standalone or for integration with a Raspberry Pi. The only difference between the two is the population of the Pi socket JP1. Both configurations provide automatic grill control, and LCD display. Set Point, manual fan mode, probe offsets, open lid detect and max fan speed configurable via buttons. The standalone requires initial configuration via serial commands. There is integrated no web access or graphs in standalone mode, but there is a serial status output to allow you to roll your own solution.
Quick and Easy: Mouser parts. Does not include thermocouple or DigiKey-only parts 1xBlower 1xSocket 4xJacks. Alternatively, HeaterMeter kits are available from the HeaterMeter store which include all the Mouser and Digikey parts as well as a PCB.
| Qty | Value | Device | Parts | Link |
|---|---|---|---|---|
| 1 | 0 | R-US_0204 | R7 | (wire) |
| 4 | 390 | R-US_0204 | R2, R10, R12, R15 | Mouser DigiKey |
| 1 | 680 | R-US_0204 | R8 | Mouser DigiKey |
| 3 | 1k | R-US_0204 | R1, R3, R21 | Mouser DigiKey |
| 2 | 2k2 | R-US_0204 | R9, R14 | Mouser DigiKey |
| 1 | 4k7 | R-US_0204 | R11 | Mouser DigiKey |
| 1 | 10k | R-US_0204 | R20 | (use 10k 1% below) |
| 5 | 100k | R-US_0204 | R19, R22, R23, R28, R29 | Mouser DigiKey |
| 1 | 68k | R-US_0204 | R13 | Mouser DigiKey |
| 1 | 22k | R-US_0204 | R4 | Mouser DigiKey |
| 9 | 0.1u | C-US025-025X050 | C1, C2, C3, C7, C10, C15, C16, C17, C18 | Mouser DigiKey |
| 1 | 1N4001 | DIODE-DO41-7 | D3 | Mouser DigiKey |
| 1 | 1N5819 | DIODE-DO41-7 | D2 | Mouser Mouser Alt DigiKey |
| 4 | BS170 | BS170 | Q1, Q2, Q4, Q5 | Mouser DigiKey |
| 1 | MCP1700-33 | MCP1700-33 | IC4 | Mouser DigiKey |
| 1 | FQU11P06TU | MOSFET-P | Q3 | Mouser DigiKey |
| 1 | 74HC595N | 74LS595N | IC3 | Mouser DigiKey |
| 1 | DIP28 | DIP28 | IC2-SOCK | Mouser DigiKey |
| 1 | Pi | PINHD-2X13 | JP1 | DigiKey (alt DigiKey) (alt Mouser) |
| 1 | ALARM | SPEAKER/AL11P | SP1 | Mouser DigiKey |
| 1 | OKI-78SR-5 | OKI-78SR-05H | IC1 | Mouser DigiKey |
| 1 | 16MHz | RESONATOR-PTH | Y1 | Mouser DigiKey |
| 4 | 10k 1% | R-US_0204 | R5, R16, R17, R18 | Mouser DigiKey |
| 1 | 220u | INDUCTOR | L1 | Mouser MouserAlt |
| 2 | 100u/10 | CPOL-USE2.5-5 | C5, C6 | Mouser DigiKey |
| 1 | 47u/25 | CPOL-USE2.5-5 | C12 | Mouser DigiKey |
| 1 | 100u/25 | CPOL-USE2.5-6 | C4 | Mouser DigiKey |
| 1 | PINHD | PINHD | J1 (LCD), J2 (PROBE), J7 (ISCP), J8 (FTDI) | Mouser |
| 1 | 10k | TRIM_US-CT6 | R6 | Mouser DigiKey |
| 1 | LCD | PINHD-1X16 | J1 | Mouser Gray/Amber LCD Color Gallery |
| 1 | TACTILE-4 | TACTILE-4 | S1 | OnlineComponents (UK Alt RSComponents) or search part no K1-1506DN-01 |
| 1 | TACTILE-4-CAP | TACTILE-4-CAP | S1-CAP | Mouser Rnd |
| 1 | ATmega328P | AVR-MEGA8-PPTH | IC2 | Mouser DigiKey Mouser Non-P |
| 3 | GRN | LED3MM | LED1, LED2, LED3 | (any ~3mm LED, any colors you want) MouserR MouserY MouserG MouserGAlt |
These are the "built in" connectors, there is space on the PCB for them. External connectors can be used for probes by attaching to the J2 pin header.
| Qty | Value | Device | Parts | Link |
|---|---|---|---|---|
| 1 | POW | POWER_JACKPTH | J9 | Mouser MouserAlt |
| 1 | RJ45-8 | RJ45-8 | JP2 | Mouser DigiKey |
| 3-4 | Probes | AUDIO-MONO | JP3, JP4, JP5, JP6 | MouserDigiKey |
| Qty | Description | Link |
|---|---|---|
| 1 | 12VDC/1A power brick 5.5x2.1mm barrel jack | USPlug EUPlug |
| 1 | Blower-style fan 12VDC 5-10CFM | DigiKey60mm DigiKey50mm DifferentBlower |
| 1-4 | Thermistor Probes -- ThermoWorks Pro-Series (Std or Needle) / Maverick ET-72/ET-73 (3ft or High Heat) | HeaterMeter Probes |
A word about 12V power adapters - It is highly recommended to get a name brand power supply. A good quality 1A supply can drive a Raspberry Pi 3, Wifi, Servo Damper, and up to a 500mA blower without breaking a sweat. Generic no-name power supplies that can be found on Amazon or eBay might cost half as much but some 1A supplies aren't even capable of providing enough power to power up the Pi and HeaterMeter and will reboot endlessly, on servo movements, or when enabling the blower. In addition, these cheap supplies can lack the noise suppression circuitry which can affect HeaterMeter readings or protection components which can make them unsafe in fault conditions. If purchasing an generic supply it is recommended to use a 2A supply at a minimum to be confident that HeaterMeter will work at all.
| Qty | Value | Device | Parts | Link | Reason |
|---|---|---|---|---|---|
| 1 | Ambient | THERMISTOR_R-2,5 | TR1 | Mouser | Only if you want an onboard 'ambient' temperature sensor |
Thermocouple support relies on surface mount soldering an 8 pin 3mm x 3mm chip and some 0805 passive components. Any 'ole capacitors (20%/16V) and resistors (10%/0.125W) will do fine. Mouser Project (does not include jack J4). If this is your first surface mount soldering experience, I recommend getting a couple extra of the cheap parts because they are easy to lose or destroy during soldering and you don't want to have to place another order for a 6 cent part.
| Qty | Value | Device | Parts | Link |
|---|---|---|---|---|
| 1 | AD849X | AD849X | IC5 | Mouser |
| 2 | 1n (1000 pF) | C-USC0805 | C8, C11 | Mouser |
| 1 | 10n (0.01 uF) | C-USC0805 | C9 | Mouser |
| 1 | 0.1u | C-USC0805 | C13 | Mouser |
| 2 | 10k | R-US_R0805 | R25, R26 | Mouser |
| 1 | 1k | R-US_R0805 | R24 | Mouser |
| 1 | PCC-SMP | PCC-SMP-K | J4 | Newark |