ZUM Radio MMDVM-Pi, Руководство пользователя

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Elite 3.5 LCD ZUMspot kit user guide
Copyright 2019-2022 ZUM Radio, Inc
3 Rev 1.0
Specifications
The MMDVM-Pi board is designed for repeater and high power hotspot applications – connects to user
supplied Raspberry Pi board and radio(s)

Utilizes a high performance 32bit ARM processor (STM32F722) running at 180Mhz (Room for
future upgrades)

Fifth generation analog filter design that provides an extremely low BER compared to previous
generations

2 Multi-turn pots for fine RX and TX adjustments

Onboard LEDs to show status and modes (PTT, COS, Power, D-Star, DMR, P25, Fusion, NXDN and
POCSAG)

Onboard LED to show receive signal level clipping

Connection for OLED and Nextion LCD screens

8 pin JST Connector with pigtail wires

Open source MMDVM firmware preloaded and easily upgraded by software
Wiring connections
Here is a picture of the 8 pin header with cable showing wire colors:
Here is a table of the pin numbers, names and wire colors:
Pin number Signal name Description Wire color
1 CTRL Control (output) Black
2 COS/STAT1 Carrier sense (input) Red
3 RX audio Receive audio from radio (input) White
4 Ground Signal ground Yellow
5 Ground Signal ground Orange
6 TX audio Transmit audio to radio (output) Green
7 PTT Push to talk (enable transmit) (input) Blue
8 RSSI Received signal strength indicator (input) Purple