5. mA. IF=10mA, Vcc=5V. Output VOL. -. -. V. Vcc=5V, IF=IFon( max.),. RL=Ω. Turn on. Threshold. Current. 1. H11L1. IFon. H11L1 from ISOCOM >> Specification: Optocoupler, Digital Output, 1 Channel, 5 kV, DIP, 6 Pins, H11L1, H11L2, Technical Datasheet: H11L1 Datasheet. The H11L1, H11L2 and H11L3 series consist of a. Schmitt Trigger optically coupled to a gallium arsenide Infrared-emitting diode in a 6-lead.

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Update New sketch not having the duplex problem: So, technically, H11L1M is the official name nowadays. Sign up using Facebook. I have made a very basic test circuit for the opto coupler H11L1 ‘similar’datasheet: This gives time for competing answers to be posted, and there are many better answerers on here than me.

R3 and D1 provide the pull-up. Dagasheet Required, but never shown. The SoftwareSerial can not transmit and receive at the same time, and that is what you are doing.

Use baud, and it should work. The H11L1 was originally made by General Electric, but cloned by many other manufacturers. However, this did NOT solve the problem. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Oh of course thought it was in sending, but if inverting that way is possible, than it’s even better.


Just doubting if the MIDI functionality will work since it will be functionally similar as now: Michel Keijzers 6, 4 17 Not all processor UARTs are alike.

H11L1 Datasheet,6-pin dip optoisolators logic output-

General Electric made lots of different H11xxx optocouplers. Remember that using SoftwareSerial means that there is not much else you can do in your sketch. Sign up or log h111 Sign up using Google. Note, different Arduinos can use different processors with different dwtasheet hardware. When I go to a nearby shop there aren’t manyI have to pay 2 euro per piece, for AliExpress it’s 10x less, also they don’t have the exact same type.

Shaving cents by using places like AliExpress is a false economy, what happens if you get knockoffs with different performance?

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The SoftwareSerial works better with higher baudrates. Almost everybody also calls it “H11L1” clones with different names, like the PC, turned out to have not been as successful.


CL Too bad they didn’t make like 3 or 4 of them in one IC.

What solved the problem was to use TWO opto-isolators. A ” ; mySerial.

H11L1 Datasheet Download

MichelKeijzers, The SoftwareSerial is useless for you, it can not transmit and receive at the same time. I want to use it for MIDI. A couple of mA that datsheet normally needed. Post as a guest Name. In the real world, I would write an interrupt routine to handle the received data. CL is correct, you had a voltage divider before and your test LED may have caused problems.

Welcome to Firmware land.