This is a fantastic project, thanks for doing this!
I wanted to ask if it might be possible to port this over to M5Stack's UIFLow (also blockly based). m5stack is a series of nice little modules based on ESP32, many of them coming with IR LED built in (e.g. m5stick and m5atom). These are perfect to use with lego, many of their modules are lego-compatible, see e.g. the m5stack fire

setMotorDirection to left/right instead of forward/backward. That's a more precise description of what the function actually does.

This code leaves itself open to being possibly brittle in its timing (especially with upgrades to the MakeCode runtime and interference from interrupts).

            // calliope correction -85, -210
            // microbit correction -65, -150
            transmitBit(markMicroSeconds: number, pauseMicroSeconds: number): void {
                pins.analogWritePin(this.pin, 511)
                control.waitMicros(Math.max(1, markMicroSeconds - 65))
                pins.analogWritePin(this.pin, 0)
                control.waitMicros(Math.max(1, pauseMicroSeconds - 150))

There is a new feature added to MakeCode beta that should make it possible implement bit-banging solutions like this to be more resilient in these cases...

microsoft/pxt#3198

Calculate a forward looking time horizon, then wait until the microsecond timer has achieved that value. Variances in timing due to different execution speeds on different versions of the runtime, or interference from interrupts should then be minimised.

Hi Philipp!
First I want to thank you for this material. Unfortunately, I must say that with new version of MakeCode package is not functional again - https://makecode.microbit.org/v0 and https://makecode.microbit.org/v1 works well, but latest version dont make connection.

Is there some way how to fix it again? Thank you very much!

Just for information: Im using Grove - Infrared Emitter http://wiki.seeedstudio.com/Grove-Infrared_Emitter/ with Grove Shield for micro:bit v2.0.
By specification it using TSAL6200 diode https://www.vishay.com/docs/81010/tsal6200.pdf