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(Smart Home Module NRF24)
WORK IN PROGRESS.
This PCB is a universal microcontroller board with many optionally placable components. It aims to be an universal base-board for many projects especially around home automation.
The pinout of the 28 pin header is listed here:
| ESP8266 | Arduino | Function | Pin | Pin | Function | Arduino | ESP8266 |
|---|---|---|---|---|---|---|---|
| GND | 1 | 2 | GND | ||||
| 5V | 3 | 4 | VCC | ||||
| 3.3V | 5 | 6 |
| 3.3V |
| RX | RX | RX | 7 | 8 | TX | TX | TX |
| GPIO4 | A4 | SDA | 9 | 10 | SCL | A5 | GPIO5 |
| GPIO12 | 12 | MISO | 11 | 12 | MOSI | 11 | GPIO13 |
| GPIO15 | 8 | CS | 13 | 14 | SCK | 13 | GPIO14 |
| A1 | 15 | 16 | Analog in | A0 | ADC (0-3.3V) |
| A3 | 17 | 18 | A2 |
| GND | 19 | 20 | GND |
| GPIO2 | 3 | MOSFET | 21 | 22 | 2 | GPIO0 |
| [GPIO13]* JP4 | 5 | MOSFET | 23 | 24 | 4 |
| GPIO16 | 7 | NRF_CE | 25 | 26 | MOSFET | 6 | [GPIO12]* JP5 |
| 10 | MOSFET | 27 | 28 | MOSFET | 9 |
*) GPIO can be connected to this pin by bridging the mentioned jumper
ATTENTION: When the MAX3485 is mounted the Arduino doesn't want to be programmed most of the time. So make sure to pull pin P3 to 3.3V.
There are multiple different module groups that can be populated.
Information about what to watch out for for the different module groups will follow.
In the table is listed, which components to populate for a given module:
| Module | Reference | Part |
|---|---|---|
| ESP8266 | U1 | ESP8266 12F |
| R1, R2, R3, R11, R24 | 10k | |
| ESP8266 ADC | R4 | 220k |
| R5 | 100k | |
| Arduino | IC1 | Arduino Pro Mini |
| NRF radio | U2 or U7 | NRF24L01+ SMD |
| C11 | 100nF | |
| (C10) | 10µF | |
| 3.3V regulator | U3 | AP2112K |
| C1, C2 | 1µF | |
| Buck regulator | U6 | LMR14010A or ACT4088 in deadbug style |
| R9 | LMR14010A: 56k ACT4088: 47k | |
| R10 | 10k | |
| C6 | 100n | |
| C7 | LMR14010A: 2.2µF 50V ACT4088: 10µF 50V | |
| C8 | 22µF | |
| L1 | LMR14010A: 22µH ACT4088: 4.7µH | |
| D1 | Schottky 40V SMA | |
| (C9) | 100µF | |
| LiPo charger | U4 | TP4056 |
| R6 | 2k2 | |
| C5 | 100nF | |
| R14 | 1k | |
| D2 | 0805 SMD LED (charging indicator) | |
| LiPo protection | U5 | DW01A |
| Q1 | FS8205A | |
| R7 | 100 | |
| R8 | 1k | |
| C3 | 100n | |
| I²C pullup resistors | R12, R13 | 10k |
| RS485 Transceiver | U8 | MAX3485 |
git clone with --recurse-submodules to include the necessary libraries too.${KIPRJMOD}\lib_includes\kicad-ESP8266${KIPRJMOD}\lib_includes${KIPRJMOD} with the absolute path to the project
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