A Motorola Radius M110 mod / modification
This mod applies to the 2 channel Motorola Radius M110 radios and consists in the replacement of the eeprom by a microcontroller capable of behaving like a i2c slave simulating a serial i2c 24c01 eeprom.
Everytime the user switches channel the radio "pulls" the channel from the eeprom.
As a consequence, if we operate on top of the eeprom data and electronically switch channels, triggering a new read in the internal organics of the frequency synthesis.
Then, we can make a new frontal with very few changes on the equipment, preserving it's original status.
Based on this idea and taking in account some compromises, I proceeded to use a raspberry pi pico board and a TM1638 board with 8 buttons and 8 leds. The drawback is the use of polling for the buttons. A TFT display and some interrupts for keys would suit better.
With these modules we're able to indicate the frequency but with limited text representation.
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VFO Mode
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Memory Mode
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Tune Step (TS) (kHz)
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Encoder (Enc) (Hz + OFF)
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Decode (Dec) (Hz + OFF)
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Timeout Timer (TOT) (s)
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Timeout Rekey (DLY/TPY/Pen) (s)
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Reverse (Rev) (+/-) ***
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Repeater Mode/Duplex (Dup) +/- Shift MHz/kHz ***
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Power (P/PA/PO) Hi/Lo (Watts)
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TxAdmit (Tad = MO/AL/NC/NC.PL)
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Display Brightness **
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Screen On/Off (Or a clear so we can keep Leds) **
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Scanning (just memories, wip)
This is a visual representation of the menu system. The unit boots and shows the frequency, either VFO or Memory. Then, by pressing the keys we can operate the radio as shown. The keys have a double function, a normal one and another when FUNC key was activated.
For example, by pressing key 1 (MENU/NEXT) the radio enters in MENU mode (F Mode) which will be identified by the first led. Any other presses on the same key, will iterate over the menu.
When in this mode, pressing keys as indicated, will allow a jump to the corresponding menu and pressing key 2 will exit F/MENU mode.
- Memories Name (Or Memory nr - no text - wip)
- How to memorize, Edit, Remove (CRUD)
- Dual VFO with same/distinct steps etc. (Needed?)
- Mem to vfo (Operate a memory channel as a VFO. How to)
- Need a way to open Squelch, hw
- 3D printed case
To build the firmware you must install pico-sdk. After installing the raspberry pi pico C/C++ SDK, you need to, from this project path:
- Create a build folder, eg: build
- Remove it first if it exists
- cd into the build folder
- export the sdk path
- invoke cmake pointing to the project CMakeLists.txt
- invoke make
for example:
$ cd ~/pico/pico110/
$ rm -rf build
$ mkdir build
$ cd build
$ export PICO_SDK_PATH=../../pico-sdk
$ cmake ..
$ make -j4
- https://github.com/mcauser/micropython-tm1638
- https://github.com/rjbatista/tm1638-library
- https://github.com/thilaire/rpi-TM1638
- https://github.com/wahlencraft/TM1637-pico
- https://github.com/lpodkalicki/attiny-tm1638-library
- https://github.com/gavinlyonsrepo/TM1638plus
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