Assembly of components (circuit)
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These instructions are for Version 3 of the NodeMCU (identification described in previous article). In Version 1 and Version 2, you have to use VIN and GND next to the MicroUSB connection, instead of VU and G.
Below is the circuit diagram of how to connect the NodeMCU, PMS5003, GSM, status LEDs and DHT22. Optionally, and also proven more successful with installs, is to also connect Pin1 of the DHT22 to 5V (VU).
The pins are listed from right to left.
| PMS5003 pin | NodeMCU pin |
|---|---|
| 1 | unused |
| 2 | unused |
| 3 | unused |
| 4 | D1 (GPIO5) |
| 5 | D2 (GPIO4) |
| 6 | unused |
| 7 | GND |
| 8 | 5V |
The pins are listed from left to right. The grid is front-facing.
| DHT22 pin | NodeMCU pin |
|---|---|
| 1 | 3V3 (3.3V) |
| 2 | D7 (GPIO13) |
| 3 | unused |
| 4 | GND |
The pins are listed from left to right. The grid is front-facing.
| Sim800l pin | NodeMCU pin |
|---|---|
| GND | GND |
| TXD | Pin D5 (GPIO14) |
| RXD | Pin D6 (GPIO12) |
| RST | Pin D8 (GPIO18) |
| Vcc | 3.3V |
| NET | unused |
In production also ensure your power source can provide at least 2A of current to the GSM module.
| LED pin | NodeMCU pin |
|---|---|
| 1 | PMS_LED cathode (+) |
| 2 | PMS_LED anode (-) |
| 3 | DHT_LED cathode (+) |
| 4 | DHT_LED anode (-) |
The pins are listed from right to left.
| PPD42NS pin | NodeMCU pin |
|---|---|
| 1 | GND |
| 2 | D5 (GPIO14) |
| 3 | VU |
| 4 | D6 (GPIO12) |
| 5 | unused |
The firmware can read IC2 hardware that is connected as follows. It has to support 3.3V.
| IC2 | NodeMCU pin |
|---|---|
| Vcc | 3V3 |
| Gnd | GND |
| SDA | D3 |
| SCL | D4 |