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Mesh Extender 2.0 Standard Power Cable Pinout
Proposed Pinout for Mesh Extender 2.0 PCB Version 4 onwards
While building a test cable, it became clear that the pinout could be improved to make assembly of the cables easier, and also to spread the strain on the D-SUB connector more evenly.
NOTE: This pinout is INCOMPATIBLE WITH THE PREVIOUS VERSION. IT WILL DESTROY Version 2 / Revision 3 Mesh Extender PCBs (and vice-versa).
NOTE: This pinout is only proposed at this point in time. Do not build cables to this specification, until confirmed.
| D-SUB 25 Female | 4-way IP67 | 3-way IP67 | 24LC16BH | Note |
|---|---|---|---|---|
| 1 | - | - | 4 (Vss/GND) | GND |
| 2 | - | - | - | RFD_IO4 |
| 3 | - | - | - | RFD_IO3 |
| 4 | - | - | - | GND |
| 5 | Connect to pin 18 | Domino TX | ||
| 6 | Connect to pin 19 | RFD TX | ||
| 7 | Connect to pin 20 | Vin Solar (connect to Vin REG when using solar panel or automotive as power supply) | ||
| 8 | - | Brown | - | Solar/Auto input + |
| 9 | - | Blue | - | Vin Auto. Optionally tie to pin 10 with 25k5 resister to ensure maximum charge current when using automotive power. |
| 10 | - | Yellow/green | - | Solar/Auto - |
| 11 | - | - | - | Domino RTS |
| 12 | - | - | - | Domino GPIO 0 |
| 13 | - | - | - | Domino GPIO 1 |
| 14 | - | - | 5 (SDA) | RFD_IO5 |
| 15 | - | - | 6 (SCL) | RFD_IO1 |
| 16 | - | - | 7 (WP) | RFD_IO6 |
| 17 | - | - | 8 (Vcc) | RFD_IO2 |
| 18 | Connect to pin 5 | RFD RX | ||
| 19 | Connect to pin 6 | Domino RX | ||
| 20 | Connect to pin 7 | Vin Regulator | ||
| 21 | Yellow/Green | - | - | GND |
| 22 | Blue | - | - | +5V |
| 23 | Brown | - | - | Battery + |
| 24 | Black | - | - | Battery - |
| 25 | - | - | - | Domino CTS |
Version 2 / Revision 3 PCB
The following table is correct for the Version 2 PCB, i.e., the third revision, including proposed errata.
Compared with the previous arrangement, we are now using the 3-wire lead for the solar panel/automotive input, and the 4-wire one for battery and +5V output, since it seems more probable that batteries and a USB charging port would be located together inside, while the solar panel alone remains outside.
NOTE: There is NO REVERSE POLARITY PROTECTION on the Mesh Extender PCBs at the moment. This is clearly not ideal, but it is the situation for now.
| D-SUB 25 Female | 4-way IP67 | 3-way IP67 | 24LC16BH | Note |
|---|---|---|---|---|
| 1 | - | - | - | GND |
| 2 | - | - | - | GND (Was RFD_IO2 on rev 2 PCB) |
| 3 | - | - | - | RFD_IO3 |
| 4 | - | - | 4 (Vss/GND) | RFD_IO4 |
| 5 | Connect to pin 6 | Domino TX | ||
| 6 | Connect to pin 5 | RFD RX | ||
| 7 | Connect to pin 20 | Vin Solar (connect to Vin REG when using solar panel or automotive as power supply) | ||
| 8 | - | Blue | - | Vin Auto (connect to Vin REG when using 12v/24v automotive power supply only). Pull down to ground with 25k5 if automotive charging fails to draw sufficient current). |
| 9 | - | - | - | Domino GPIO 0 |
| 10 | - | - | - | Domino CTS |
| 11 | Brown | - | - | Battery + |
| 12 | - | Brown | - | Solar/Auto input + |
| 13 | Blue | - | - | +5V |
| 14 | - | - | 8 (Vcc) | RFD_IO2 (Was GND on rev 2 PCB) |
| 15 | - | - | 7 (WP) | RFD_IO6 |
| 16 | - | - | 6 (SCL) | RFD_IO1 |
| 17 | - | - | 5 (SDA) | RFD_IO5 |
| 18 | Connect to pin 19 | RFD TX | ||
| 19 | Connect to pin 18 | Domino RX | ||
| 20 | Connect to pin 7 | Vin Regulator | ||
| 21 | - | - | - | Domino RTS |
| 22 | - | - | - | Domino GPIO 1 |
| 23 | Black | - | - | Battery - |
| 24 | - | Yellow/green | - | Solar/Auto - |
| 25 | Yellow/Green | - | - | GND |
