Wireless DIY DRO Adapter for iGaging Scales
TouchDRO adapter for iGaging linear DRO scales supports iGaging EZ-View DRO Plus, iGaging DigiMag Remote DRO and iGaging Absolute DRO Plus scales with Micro-USB cables. Older iGaging scales and the new Shahe Remote Digital DRO Display scales can be connected by using appropriate breakout boards. The circuit is specifically designed to achieve excellent stability, reliability, and noise resistance with capacitive DRO scales.
Designed from the ground up to provide the best performance and reliability, this is the most popular TouchDRO BlueTooth adapter. It is compatible with the classic iGaging DigiMag Remote DRO, AccuRemote, iGaging Absolute DRO+,iGaging EZ-View, and other 21-bit scales. In addition to four linear scale inputs, the controller supports a tachometer and a touch probe/height setter input.
All genuine TouchDRO adapters are fabricated and assembled to stringent IPS-A-600/610 Class II or better standard and use quality name brand components for best reliability and durability. I personally inspect and program every board and run it through a full range of tests (scale connectivity, bluetooth, etc.) right before shipping it to you.
|Power Supply||5V DC|
|Current Draw||Approx. 30 mA|
This DRO adapter firmware supports capacitive linear scales that use iGaging 21-bit protocol, iGaging Absolute protocol and BIN6 protocol. This inludes:
- iGaging EZ-View DRO Plus
- iGaging DigiMag (and it's rebranded variants)
- iGaging Absolute DRO Plus
- Shahe 5403-xxx "Digital Liner DRO Scales with Round Display"
- Shahe 5403-xxxA "Digital Liner DRO Scales with Square Display"
Scales that come with Micro-USB cables are fully plug-and-play (i.e. don't require any soldering or assembly). For scales that use Mini-USB cables refer to the "Connecting the Scales" section on the Documentation tab for connection details.
|X,Y,Z,W Inputs||Inputs for four linear axes.|
|Tach||Tachometer input (unbuffered).
Tachomter requires optical encoder with quadrature output
|Probe (unbuffered)||Tool height setter/touch probe input|
|Power||Micro-USB Power supply input, 5V DC nominal.|
This DRO adapter board comes with pre-installed USB Micro-B female connectors. Next to each connector there is a set of holes for a 5-pin 0.1" header that break out Vcc, Ground, Clock and Data lines for the axis.
The board is setup to accept a tachometer that has either push-pull or line driver quadrature output.
Inexpensive touch probes and tool height setters work similar to a simple electrical switch. Depending on the configuration, when the probe touches the workpiece, it either opens the circuit or closes it (normally-closed or normally-open, respectively). TouchDRO board supports (and automatically detects) both types.
The probe can be connected as follows: connect one side of the switch to Vcc and the other to the probe pin. If the probe has a LED, it has to be reverse-biased (backwards), or the input won't work. To test this, connect the probe to Vcc and Ground. If the LED lights up (either when the probe is touching or not touching), reverse the leads.
This DRO adapter is designed to be powered by a common Micro-USB power supply such as phone charger. Alternatively, +5V and Ground pins are broken out next to the Micro-USB connector to allow the use of a panel-mounted power supply jack instead.
DRO scale adapter has two status LEDs:
- Greel - Heartbeat/status
- Blue - BlueTooth
When the board powers up, the green LED will blink rapidly for 2 seconds indicating that the protocol detection is in progress. During protocol detection, DRO will not read the position. After two seconds, it will start blinking once-per-second indicating normal operation.
The blue LED is used to indicate the connection status. It can be in one of three modes:
- When the board is not paired, the LED will blink twice per second.
- Once paired, the blinking pattern will change to one brief pulse every 2 seconds.
- When the board is connected to the application, the LED will switch to two brief pulses every 2 seconds.
Connecting the Scales
- iGaging EZ-View DRO Plus, DigiMag "Remote DRO Display" and Absolute DRO Plus scales that come with Micro-USB cables can be plugged directly into the pre-installed USB Micro-B connectors
- iGaging DigiMag "Remote DRO Display" scales (and their rebranded versions such as Shars Digital Machine Scales and AccuRemote DRO scales) with Mini-UBS connectors can be connected using a straight USB Mini-to-Micro adapter
- iGaging Absolute DRO Plus and Shahe 5403-xxxA Linear Scales with Remote Square Display can be connected using a set of USB Mini-B breakout boards
- iGaging Absolute DRO Plus and Shahe 5403-xxxA Linear Scales with Remote Round Display require custom connector or a direct connection
- Disconnect the power supply
- Plug-in the scales
- Re-connect the power
It is important to power-cycle the board after connecting the scales or the touch probe to allow the firmware to run the protocol detection routine.
Proper grounding is vital to relaible funciton of iGaging DRO scales. Unreliable ground connection or ground loop can lead to such issues as drifting positon or random resets. In order to avoid ground loops, there should be a single reliable connection to the machine chassis. Ideally, scale frames should be isolated from the machine. If the cables are shielded, the shields should be tied to the ground only on one side, and as close to the central grounding point as possible.
The board provides a number of easily accessible grounding poins. Each port has a dedicate ground pint that is tied to the common ground pour. There are two ground pins next to each Micro-USB port and finally, the mounting holes are tied to the common ground as well.