-
Notifications
You must be signed in to change notification settings - Fork 83
HeaterMeter 4.3 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. This list is split into three sections
- Main HeaterMeter Board which contains the input power and probe connections, as well as the blower and servo output.
- LCD and Button Board which contains the drive circuitry for the 16x2 character LCD and buttons, as well as the 3 indicator LEDs. Optional if a local display and buttons are not desired.
- Thermocouple Addon, which are components added onto the Main Board to utilize a thermocouple control probe instead of the thermistor. The FOODx probes remain as thermistors. Optional
Quick and Easy: Mouser base parts and LCD/button parts (does not include thermocouple parts below). Alternatively, HeaterMeter kits are available from the HeaterMeter store which include all relevant parts as well as PCBs.
| Qty | Value | Device | Parts | Link |
|---|---|---|---|---|
| 3 | 1k | R-US_0204/7 | R1, R3, R21 | Mouser DigiKey |
| 1 | 2k2 | R-US_0204/7 | R14 | Mouser DigiKey |
| 5 | 10k 1% | R-US_0207/7 | R5, R16, R17, R18, R20 | Mouser DigiKey |
| 1 | 22k | R-US_0204/7 | R4 | Mouser DigiKey |
| 1 | 68k | R-US_0204/7 | R13 | Mouser DigiKey |
| 5 | 100k | R-US_0204/7 | R19, R22, R23, R28, R29 | Mouser DigiKey |
| 8 | 0.1u | C-US025-025X050 | C1, C2, C3, C7, C15, C16, C17, C18 | Mouser DigiKey |
| 1 | 100u/25 | CPOL-USE2.5-6 | C4 | Mouser MouserAlt DigiKey |
| 2 | 100u/10 | CPOL-USE2.5-5 | C5, C6 | Mouser DigiKey |
| 1 | 47u/25 | CPOL-USE2.5-5 | C12 | Mouser DigiKey |
| 1 | 16MHz | RESONATOR-PTH | Y1 | Mouser DigiKey |
| 2 | 1N5819 | 1N5819 | D2, D3 | Mouser Mouser Alt DigiKey |
| 1 | 220u | INDUCTOR9MM | L1 | Mouser MouserAlt |
| 1 | ALARM | SPEAKER/AL11P | SP1 | Mouser DigiKey |
| 3 | BS170 | BS170 | Q1, Q2, Q5 | Mouser DigiKey |
| 1 | FQU11P06TU | MOSFET-P | Q3 | Mouser DigiKey |
| 1 | OKI-78SR-5 | OKI-78SR-05H | IC1 | Mouser DigiKey |
| 1 | ATmega328P | AVR-MEGA8-PPTH | IC2 | Mouser DigiKey MouserNon-P |
| 1 | MCP1700-33 | MCP1700-33 | IC4 | Mouser DigiKey |
| 3-4 | PROBES | AUDIO-MONO | JP3, JP4, JP5, JP6 | v4.3.5 Mouser v4.3.5 DigiKey v4.3.6 Mouser |
| 1 | POW | POWERJACKPTH | J9 | Mouser MouserAlt |
| 1 | RJ45-8 | RJ45-8 | JP2 | Mouser DigiKey |
| 1 | DIP28 | DIP28 | IC2-SOCK | Mouser DigiKey (Optional) |
| 1 | RPi | PINHD-2X13 | J1 | Mouser DigiKey Mouser2 DigiKey2 DigiKey3 (MouserWorseAlt DigiKeyWorseAlt) |
| Qty | Value | Device | Parts | Link |
|---|---|---|---|---|
| 2 | 220 | R-US_0204/7 | R12, R15 | Mouser DigiKey |
| 1 | 1k | R-US_0204/7 | R10 | See above |
| 1 | 1k2 | R-US_0204/7 | R8 | Mouser |
| 1 | 1k8 | R-US_0204/7 | R11 | Mouser |
| 1 | 3k9 | R-US_0204/7 | R2 | Mouser |
| 1 | 8k2 | R-US_0204/7 | R9 | Mouser MouserAlt |
| 1 | 10k | POTENTIOMETER | R6 | Mouser DigiKey |
| 1 | 0.1u | C-US025-025X050 | C10 | See above |
| 1 | 74HC595N | 74HC595N | IC3 | Mouser DigiKey |
| 1 | BS170 | BS170 | Q4 | See above |
| 1 | LCD, LCD1M, LCD2M | PINHD-1X16, 1X5 M | J1, JP1, JP8 | Mouser |
| 2 | LCD1F, LCD2F | PINHD-1X5 F | JP1, JP8 | Mouser |
| 4 | BUTTONS | TACTILE-12MM | S1, S2, S3, S4 | Mouser |
| 1 | RED,YEL,GRN | LED3MM | LED1, LED2, LED3 (any ~3mm LED, any colors you want) | MouserR MouserY MouserG MouserGAlt |
| 1 | LCD | NEWHAVENLCD | LCD | LCD Color Gallery |
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 |
| 1 | PCC-SMP | THERMOCOUPLE | J4 | Newark |
| 1 | 1k | R-US_R0805 | R24 | Mouser |
| 2 | 10k | R-US_R0805 | R25, R26 | Mouser |
| 1 | 10n (0.01 uF) | C-USC0805 | C9 | Mouser |
| 2 | 1n (1000 pF) | C-USC0805 | C8, C11 | Mouser |
| 1 | 0.1u | C-USC0805 | C13 | Mouser |
| Qty | Description | Link |
|---|---|---|
| 1 | 12VDC/1A power brick 5.5x2.1mm barrel jack | MouserUSPlugDigiKeyUSPlug EUPlug |
| 1 | Blower-style fan 12VDC 5-10CFM | Mouser DigiKey50mm DifferentBlower |
| 1-4 | Thermistor Probes -- ThermoWorks Pro-Series (Std or Needle) / Maverick ET-72/ET-73 (3ft or High Heat) | Amazon-T-Std Amazon-T-Needle Amazon-M-3ft Amazon-M-High |
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.
- 4.3.3 - Initial release
- 4.3.4 - Larger annular rings, chamfered corners, better labels
- 4.3.5 - Conversion to KiCad, replace power and probe jack holes with slots
- 4.3.6 - Replace probe jacks with CUI MJ1-2503A (were MJ-2508N), thermocouple holes with slots