Well, this will probably useless info to most, but i will put it here for those who might be interested. I was mistakenly sent the retrofit kit rather than the wireless remote, but it gave me a chance to examine both parts. Some of this stuff will be obvious to some folks, but I figured being thorough wouldn't hurt. Besides, it might help people with repairs or mods down the line.
Observations from the NOVA gear (ie: **NOT THE SHOPSMITH**):
The regular ribbon cable (2x5 pins) is the power/signal cable to the LCD screen. They are using a BC1602B2 screen, which means that it has +5V on pin 1, GND on pin 2, and then the rest of the pins are contrast, select, enable, and data. In the case of the wireless receiver, i am sure they are just tapping it for the 5V/Gnd connections since they are convenient.
The flat ribbon cable (1x10 pins) comes from the keypad membrane. Its a pretty typical membrane type setup. Each button has its own pin. From my measurements, it appears that the off button is isolated from the other buttons. I haven't checked the circuit while under power, so it remains to be seen if the "common" leads marked below are high or low. The buttons appear to be normally open, momentary contact style.
Code: Select all
1 -- COMMON
2 -- OFF
------------------
3 -- On
4 -- FWD/REV
5 -- Program P
6 -- Selector E
7 -- Mode M
8 -- Down RPM
9 -- UP RPM
10 -- COMMON
Based on this observation, and the configuration of the board via visual inspection, it would seem that the buttons are all passthrough on the 1x10 interface. However, the radio transceiver has the ability to trigger the button's signal line as needed.
The radio transceiver is built around an AlfaPlus ARF2496K single chip transceiver. Inspection of the board confirms this function since you can clearly see the traces on the PCB for the antenna.
There is an ATMLH042 chip, which I have yet to find a datasheet on.
more to come...
Mark 7, Pro Planer, Jointer, Bandsaw w/Kreg, Biscuit Joiner, Belt Sander, Jig Saw, Ringmaster, DC3300, Overarm Pin Router, Incra Ultimate setup
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