Handheld Scientific BT-500 Bluetooth Adapter Discussions | Drop

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Handheld Scientific BT-500 Bluetooth Adapter

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user888

Oct 25, 2018

Using a QMK-based keyboard, it doesn't work. It's missing and swapping key when typing. Macros and multiple key strokes (programmed in QMK) don't work. Eg. I have copy and paste keys which send cmd+C and cmd+V. Via Bluetooth, most of the times these are not being sent. Also, I have macros. If I send the macro '1234567' then I only receive '135'. I there a maximum typing speed / matrix scan rate?

Oct 25, 2018

handheldsci

153

Oct 27, 2018

user888Could you tell us specifically which QMK keyboard you are using? The bt-500 is tested to work with at least some of those keyboards such as input club k-type. Also does the problem happen in both USB and Bluetooth interfaces? The max speed for USB is 100 keys per second, far exceeds normal typing rate. We have not had reports of missing and especially swapping keys with any keyboard for normal use.

Oct 27, 2018

user888

Nov 9, 2018

handheldsciHi. I did some more testing. It happens both via USB and Bluetooth. Biggest problem is that key combo's sent from a QMK-programmed macro are not being received most of the time. It looks like QMK sends it so quick that it's not registered by the BT-500. I have a Kinesis Advantage keyboard with a 'Stapelberg controller' which is a Teensy 2.0 with QMK firmware on it.

Nov 9, 2018

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handheldsci

153

Nov 9, 2018

user888If it is too fast even in USB for the BT-500, I guess the only way to make it work is to slow down the output of your board. If you build your own firmware I guess it is easy: just add some delay between the characters when sending the macros. We have tested the BT-500 with many devices that output a lot of characters like barcode scanners and credit card readers. The USB interface always work without missing characters. By the way the BT-500 already has macros which is very easy to set up. Why just use that instead of jumping through the hoops to build the QMK firmware?

Nov 9, 2018

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user888

Nov 12, 2018

handheldsciI don't know what's happening. There is not much QMK options that I can play with. I tried to reduce the debouncing delay, but it didn't help. What I'm experiencing:

Missed keys
Not working key combos
Not working macros
Sometimes last typed key is repeated endlessly until I tap another key

This happens both on Bluetooth and USB. Example of not working key combo:

Select A (Cmd + A), defined in QMK as LGUI(KC_A)
Works half of the time

Example of not working macro:

Copy macro:
key down KC_LGUI
key down KC_C
key up KC_C
key up KC_LGUI

Missing keys is just during normal typing
Repeating keys is often when multiple keys are pressed
I defined a different layer in QMK with symbols like =_+-, those are not working at all. Which is strange, because they are send by QMK. The OS (and the BT-500) are agnostic about those layers.

All is working fine when directly connected to my Mac.

Nov 12, 2018

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