TechnicRobot

Hi imurvai both circuit need external power supply to drive infrared LED, i have tested around 3m to 4m is ok, but max distance not measured. i also want to develop similar app for testing :)

right, like the playlist contains a list of different audio (command), or can compose a long audio file combined with different audio (command). so you can synced to another music

Recently of my experiment how normal audio output signal convert into LEGO Power Functions RC Protocol infrared signal. My audio command files are specially composed to meet the LPF RC Protocol Combo direct, Combo PWM and Single output mode. Any MP3 music player with audio socket can act as LEGO Power Functions 8885 IR Remote Control (6034989) and 8879 IR Speed Remote Control (6019910) to send LPF RC Protocol infrared signal. The demonstration used mobile phone to remote control LEGO Power Functions Motor and Servo Motor forward, backward and PWM in 7 steps. The basic circuit used 2N3904 NPN transistor to convert MP3 audio output signal into LEGO Power Functions RC infrared signal, to control LEGO Power Functions Motor. The basic circuit simple but requires higher power to drive. The advanced circuit used LM393 comparator and 2N2907 PNP transistor to convert MP3 audio output signal into LEGO Power Functions RC infrared signal, to control LEGO Power Functions Motor. The advanced circuit complex than simple circuit but requires less power to drive. My LPF RC Audio Command Files Download: https://drive.google...dit?usp=sharing

when my copper tubing glue with cross axle extension connector using Epoxy, need to very accurate vertical, otherwise the motor will not smooth (friction between the motor axle and beam hole)

Recently, i also made similar experiment like you to make LEGO motor. i have made a Technic cross axle coupler and bracket on general DC Motor. Then, the motor can be connected with other LEGO Technic parts. Also, due to the motor speed very high (low torque), so i created a gear box to gearing down to increase torque, and used on Technic set 9396 Helicopter for testing.

It is not possible using PF IR remote to send EV3 IR Beacon signal, because the new beacon message binary never used in any PF IR remote. but the Beacon signal still using LPF RC Protocol, then i have found the new EV3 IR Beacon message binary representation as below: Channel 1: start 0100 0000 0000 0110 stop Channel 2: start 0101 0000 0000 0100 stop Channel 3: start 0110 0000 0000 0010 stop Channel 4: start 0111 0000 0000 0000 stop i have tested those message binary, transmit LEGO EV3 IR Beacon signal using Arduino