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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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I have made a very basic test circuit for the opto coupler H11L1 ‘similar’datasheet: The LED datasheey ohm resistor is only for testing.

Also I tested before in an even simpler circuit that the signals from the H11L1 pass through pin 4 although inverted, which seems to be normal. I’ve reorganised it for clarity. The SoftwareSerial works better with higher baudrates. The lower the baudrate, the more trouble you get. Unless you aim for a high baudrate ofthen SoftwareSerial can cause dqtasheet again.

Remember that using SoftwareSerial means that there is not much else you can do in your sketch. When SoftwareSerial is used with a very low baudrate ofthen it could even disturb the receiving of data of other hardware serial ports.

H11L1 Datasheet Download

Because SoftwareSerial disables interrupts during transmitting and receiving, the lower the baudrate, the longer the interrupts will be disabled. The SoftwareSerial can not transmit and receive at the same time, and that is what you are doing.

Use one of those to do tests with a serial port.

As soon as you start using SoftwareSerial for a test, you are actually testing the SoftwareSerial itself. There is an alternative, the AltSoftSerial Library.

H11L1 Datasheet(PDF) – Motorola, Inc

H11,1 a baudrate that is not too high, baud should be fine. The reason to do this is not to use a software serial and having no problems with the duplex. I thought I need a Mega, but with two Uno’s it is also possible. What solved the problem was to use TWO opto-isolators. The H11L1 inverts the signal, and it seems I had to connect the output of the first H11L1 to the input of a second and now it works. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your datzsheet use of the website is subject to these policies.


Home Questions Tags Users Unanswered. H11L1 opto isolator does not pass signal to Arduino correctly Ask Question. Update New sketch not having the duplex problem: A ” ; mySerial. I put it in an answer for clearity. Michel Keijzers 6, 4 17 I’m still looking around.

When looping back, you are depending on the Atmel processor hardware to buffer up received data while your software is busy transmitting it. Then you are depending on the Arduino serial libraries to get that buffered data if there is any after the it was already received.

It is like talking and listening at the same time. Instead of the usual taking then listening in turn. Interestingly, I can’t find an exact match to this problem if in fact it is a problem. So they write sketches which expect to talk in turn.

You, on the other hand, probably need to write a sketch which will work byte by byte. Take a look at “Serial. This is a long way to go just to test the optical coupler.

Perhaps I should add.

In the real world, I would write an interrupt routine to handle the received data. All it would do is maintain a buffer of received data that is long enough to contain any expected messages until I could get around to reading it.

So when I’m off sending data I will not miss any data being sent to me. I am not sure how the Arduino serial libraries are written. But they need to be simple so as to be small and compatible with as many other Arduino libraries as possible.

R2 and R3 form a voltage divider that prevents a proper high voltage; you have to connect the LED to 5V as shown in Transistor’s answer. Jun 25 ’17 at Transistor 3 With the LED only for testing, the actuall pull-up is missing.

He can put the actual pull-up back when finished testing. I like how Transistor cleaned up your circuit. CL is correct, you had a voltage divider before and your test LED may have caused problems. Note, different Arduinos can use different processors with different internal hardware.

Not all processor UARTs are alike. Some have more hardware buffering which off loads the burden of serial timing from the software. There is a balance between cost, hardware features and software complexity.

Welcome to Firmware land. R3 and D1 provide the pull-up. The open-collector output will pull it down when turned on giving almost 5 V across the R3 – D1 combination. Yes, you’ve discovered the difference between software and firmware: Most copies use the same Atmel chip. But the bigger and more elaborate boards use complex chips.


Some with ARM cores. It will be these differences in chips which may turn out to make your high level code work differently better in some cases. If you really need this full duplex all the time? Jot 2, 1 5 I will try with higher baudrates To be honest, I have a Mega, but I don’t ‘dare’ to use it, since that one is now on a breadboard circuit that I’m for sure knows it works and by disassembling it, I’m afraid I don’t have any working solution.

I have ordered a new one, and will test it again when I receive it. In general, software serial is incapable of handling data rates like without high incidence of errors. MichelKeijzers, The SoftwareSerial is useless for you, it can not transmit and receive datashewt the same time.

JamesWaldby With lower baudrates, the interrupts are disabled for longer time. With a full sketch and lots of things going on, it will cause a lot of trouble for sure. I tried withand no changes I will try this test again when I have the new Mega.

Find which fixed pins are for RX and TX pjrc. Use baud, and it should work. However, this did NOT solve the problem. Jun 26 ’17 at 6: 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: Thanks for dahasheet remark Sign up or log in Sign up using Google.

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