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EMIT Case Modification

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ControlBits edited this page Nov 28, 2020 · 8 revisions

Welcome to the EMIT Developer Wiki!

A Guided Tour Of EMIT's Features

EMIT Firmware Development Guide (MicroPython)

1. Getting EMIT ready for firmware development
2. Writing and uploading firmware to EMIT
3. Measuring temperature & humidity with the AM2302
4. Connecting EMIT to the Internet
5. Adding an accurate Timestamp with NTP
6. Transmitting data over MQTT
7. Using the relay for control
8. Logging data to the microSD card
9. Adding a web server to EMIT
10. Exploring EMIT's expansion connector

EMIT Firmware Development Guide (Arduino)

1. Getting EMIT ready for firmware development
2. Writing and uploading firmware to EMIT
3. Measuring temperature & humidity with the AM2302
4. Connecting EMIT to the Internet
5. Adding an accurate Timestamp with NTP
6. Transmitting data over MQTT
7. Using the relay for control
8. Logging data to the microSD card
9. Adding a web server to EMIT
10. Exploring EMIT's expansion connector

EMIT Case Modification Application Note

Useful Resources

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For environmental monitoring and control applications, it is often necessary to mount the sensor on the wall. To help with this, EMIT has been designed to fit in a low cost, off-the-shelf, vented case made by CamdenBoss (CamdenBoss Part No.: CBRS01VWH). In order to use this case, a very simple modification is required.

EMIT case modification photo 1

As shown in the photo above, in some cases the 'BOOT' button on the ESP32 DEV-KIT-V1 module can interfere with some unused, PCB mounting post moulded into the top of the case. If these posts are not removed, it is possible that the BOOT button will be permanently depressed when you fit the lid - casing EMIT not to function correctly.

As EMIT can be fitted into the case either way up (AM2302 at the top or bottom of the case), it is recommended that both of the PCB mounting posts shown in the photo above are removed.

Thankfully, these posts are easily removed using an 8 to 10mm diameter drill bit, twisted by hand (no tools are required).

EMIT case modification photo 2

Other hints and tips for using the case ...

While using this case with EMIT in several different applications we've noticed a few things which we hope might help ...

1) Mount EMIT in the case with the Temperature and Humidity sensor at the bottom Typically, the air currents that are adjacent to the walls of a room tend to move in an upwards direction as indicated by the arrow in the photograph below. Mounting EMIT in this orientation helps to ensure that the air passing over the Temperature & Humidity sensor is taken directly from the room.

It should also be noted that the linear regulator on the ESP32 DEV-KIT-V1 module (shown in the red circle below) generates heat so by mounting EMIT 'Temperature sensor down' means that any heat generated by the ESP32 module will not interfere with your measurements. This heating effect can be minimised by using lower voltages to power your EMIT, wherever possible, use a 6v DC supply.

EMIT case in use

2) Use the cable-tie holes for cable strain relief The EMIT board has 4 holes, designed to take two cable-ties (supplied with the EMIT kit). These cable ties are important to help minimise any strain applied to the cable - minimising the risk of the cables pulling out of the screw-terminals.

3) NEVER switch loads greater than 12 volts! EMIT has been designed for a working voltage range of 6v to 12v DC. DO NOT UNDER ANY CIRCUMSTANCES attempt to connect or switch voltages greater than 12v with your EMIT.