Bill of Materials
This is a list of all the parts needed to make this project. Many of the smaller parts can be purchased from alternate suppliers. The links provided are where I bought the parts.
| Part | Description |
|---|---|
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QT Py ESP32-S2 with uFL You can also use the version with a built-in antenna, and skip the external antenna. This might affect the wifi range. |
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50mm Flat Antenna Molex P/N: 1461530050 |
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STEMMA QT Cable, 100mm Length Other cables will work, needs to have JST-SH 4-pin connector on one end. |
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| BME280 Breakout |  |
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5V, 1A Power Supply Any power supply that produces 5V at 1A or more will work. You probably don't even need 1A on the power supply. |
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I bought these parts from McMaster-Carr. The links below are for packages of more than one, so you only need to buy one of each.
| Part | P/N | Quantity | Where Used |
|---|---|---|---|
| PHMS, #2-56, 3/8” Length, CRES | 91772A079 | 2 | CPU Holder |
| Nut, #2-56, 3/16” Hex, CRES | 91841A003 | 2 | CPU Holder |
| Heat Set Insert, #4-40 | 93365A120 | 1 | BME280 Mounting |
| PHMS, #4-40, .3125” Length, CRES | 91772A107 | 6 | BME280 Mount, Sensor Holder Mount, CPU Cover Mount |
| Nut, #4-40, .25” Hex, CRES | 91841A005 | 5 | Sensor Holder Mount, CPU Cover Mount |
| FHMS, #8-32, 3.5” Length, CRES | 91771A211 | 3 | Wing Holders |
| Nut, #8-32, 11/32 Hex, CRES | 91841A009 | 3 | Wing Holders |
The connectors and contacts below I used to connect the device to the power supply. Feel free to use something else if you prefer.
| Part | Quantity |
|---|---|
|
Capacitor, 220uF, 16V Size of this part is not critical. I am using 220uF, 16V because I had that lying around. If you use something different, make sure it has more than 5V rating. The physical size should be 10mm diameter or less. |
1 |
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Thru Hole Diode Recommended so that nothing wierd happens when powering the device over USB. You can omit this component if you never plug in both the USB port and the DC power supply. Pretty much any diode that is capable of ~1A of current and >5V reverse voltage will work. |
1 |
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Molex SL Connector, 2-pin, Female Molex P/N: 0050579402 |
1 |
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Molex SL Connector, 2-pin, Male Molex P/N: 0701070001 |
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Molex SL Contacts, Female Molex P/N: 0016021124 |
2 |
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Molex SL Contacts, Male Molex P/N: 0016020115 |
2 |