Hardware_Parts Selection
The following table summarises the parts selected for this project. Note prices were at the time of purchase and vary with supply/demand and exchange rate.
| Part | Function | Cost | Source | Datasheet |
|---|---|---|---|---|
| ESP8266 ESP12F | Microprocessor / Wireless | A$ 2.10 | Aliexpress |
ESP-12F ESP-12K |
| NodeMCU V1.0 (Rev2) | Microprocessor / Wireless; Development board used for prototype based on ESP12E |
A$12.95 | eBay | Summary |
| AMS1117 Step down module | 5V to 3.3V conversion | A$ 0.67 | Ebay AU | KMS1117-3.3 |
| ADS1015 ADC module | External I2C 12-bit ADC | A$3.35 | Aliexpress | datasheet |
| Adafruit White Enclosure for Arduino | Project Box (note I now have a 3D printer and preferably would print enclosure) | A$ 22.56 | Core Electronics |
CAD dimensions, Tutorial |
| LCD 1602 I2C display | Digital 2-line 16-character temperature display | A$ 1.50 | Ebay AU |
Hitachi HD44780, I2C PCF8574A backpack |
| Rotary Encoder Switch Module KY-40 | Menu & character entry | A$ 0.76 | Aliexpress | KY-040 |
| Rotary Encoder knob | Turn knob | A$ 0.26 | Aliexpress | |
| Maverick PR-001 Food Probe (fits ET-732/ET-733 Thermometer models) | Meat High Temp Probe w/ 6ft stainless steel braided cable | US$20.00 | Maverick Industries | SeMitec thermistor datasheet |
| Maverick PR-002 BBQ Probe | Smoker & Chamber (blunt) Temperature Probe w/ 6ft stainless steel braided cable | US$20.00 | Maverick Industries | See above |
| 2.5mm mono audio jack - panel mount | Enclosure temp probe receptacle jack (2 pieces) | A$ 1.90 | Jaycar | Audio jack |
| Miscellaneous passive electronic components | 1) 75k + 9.1k ohm resistors (1%) for thermistor bias resistors 2) female Dupont wires to JST-XH connect LCD 3) 1x 470nF electrolytic capacitor for power stabilisation 4) 2x 100k ohm resistors + 2x 100nF caps for RC lowpass thermistor filtering, 5) 2x 10k resistors I2C pull-up resistors |
<A$ 5.00 | Jaycar or EBAY AU, etc. |
Note that if a manufacture's datasheet is not available for a specific part used in this project, then the linked datasheet is assumed to be an equivalent part
Depreciated Components (dropped from project)
| Part | Function | Cost | Source | Datasheet |
|---|---|---|---|---|
| ESP8266 ESP07 | Microprocessor / Wireless | A$ 2.90 | Ebay AU |
ESP-07 ESP-07S |
| Ext Antenna 2.4 Ghz 3Dbi U-Fi (optional for use with ESP12K) | Improved Wifi connectivity | A$ 2.54 | Ebay AU | |
| ESP8266 Adaptor Plate | Easier connections - considering dropping this | A$ 1.00 | EBAY AU | |
| TI CD4066BE | CMOS Quad bilateral switch used for analog multiplexing | A$ 0.27 | Ebay AU | CD4066B |
| LM358 Dual OpAmp | Thermistor voltage scaling and offset for ADC specs (SOP8 SMD) | A$ 1.90 | Aliexpress | TI LM358 |
