21bit Dongle
Les Jones has provided a set of software for the igaging style 21bit protocol, and this is available as a module complete with USB socket for use with the DRO350.
Dimensions of mini USB socket
The dongle is basically identical to the QCC100, but uses a 10MHz resonator rather than the 20MHz one. This is to allow the board to run at 3.3V and then use the input comparators to convert the output to 5V for the DRO350.
Parts List
| Part | Farnell | Notes |
| PIC12F629 | 975-8992 | Observe Anti-Static Precautions When Handling |
| 10MHz Res | 144-8127 | |
| 100n Cer Capacitor | 581-2768 | |
| 4pin RA Molex Header | 296-4956 | |
| 4pin Molex Shell | 143-128 | |
| Molex Pins (x4) | 977-3789 | |
| Link Wires ( 4x assort ) | Red, White, Green, Black to match USB Socket Cable | |
| QCC100 PCB | Shumatech | |
| Mini USB Panel Mount Socket | PX0446 |
By changing R35 to 360R, the second regulator can be changed to provide 3.3V to power the dongle. This mans that the dongle can't be mixed with older scales. An alternative is to provide an additional 3.3V regulator on the dongle, and run a separate +5V supply to the board, as is done currently when using the QCC dongle in parallel with 1.5V scales.
iGauging Scales
Current investigation has shown these type of scales to be a lot more stable than their predecessors. Even with the threshold set to '0' on the DRO350, only the final digit flickers occasionally. I've yet to secure a scale to the MicroMill and check readings against the Mach3 DRO readout, but I am not expecting any surprises other than perhaps a small difference over full range movement.
Shows the complete kit of parts supplied with the scale.
I will create drawings of the rail and read head as time permits.