01-15-2024, 12:00 PM
01-15-2024, 02:59 PM
(01-15-2024 12:00 PM)pito Wrote: [ -> ]Hi, looking for a hint/link on a DIY infra to serial converter project (bidirectional - TX and RX) somebody wants to share?
Thanks!
Why do that when it already has a hardware serial port?
01-15-2024, 03:04 PM
Hello,
Some information about HP48 interface (with IR circuit).
A receiver (only) for IR with an Arduino.
Some information about HP48 interface (with IR circuit).
A receiver (only) for IR with an Arduino.
01-15-2024, 06:07 PM
(01-15-2024 03:04 PM)gege Wrote: [ -> ]A receiver (only) for IR with an Arduino.Very much recommended. And there is a possibility to control the sending LED as well with some Arduino coding
01-16-2024, 12:38 PM
Thanks for the hints!
Why I want the infra - my 48gx is in perfect condition and I do not want to risk a damage while messing with hw serial (as the calculator is almost not repairable).. And yes, I made myself the hw serial long time back, it worked fine.
PS: here is an another receiver only for a printer. Also there is a discussion on the IR receiver chip as well..
Why I want the infra - my 48gx is in perfect condition and I do not want to risk a damage while messing with hw serial (as the calculator is almost not repairable).. And yes, I made myself the hw serial long time back, it worked fine.
PS: here is an another receiver only for a printer. Also there is a discussion on the IR receiver chip as well..
01-19-2024, 08:23 AM
Hi pito,
i made a lot of serial stuff of diy sensors, compass devices, interfacess, controllers etc for my HP48
in the last 20 years and had never a problem with the serial port.
You can use opto couplers connected to your serial port or in the circuit instead of a direct connection, but it is not really neccessary.
I have built some of the converters as mentioned in this thread. The software is free (Thanks to Martin Hepperle) and easy to maintain. It has a debug mode, so you can test the connection in both directions with a simple terminal app (Pressing "T" invokes the transparent mode)
However i like this litte box and use it for my HP48/28 with Christoph Gießelink's ir printer emulation as you can see:
[attachment=13202]
[attachment=13203]
You can print programs and safe them on a PC, which is for the HP28 essential.
Ralf
i made a lot of serial stuff of diy sensors, compass devices, interfacess, controllers etc for my HP48
in the last 20 years and had never a problem with the serial port.
You can use opto couplers connected to your serial port or in the circuit instead of a direct connection, but it is not really neccessary.
I have built some of the converters as mentioned in this thread. The software is free (Thanks to Martin Hepperle) and easy to maintain. It has a debug mode, so you can test the connection in both directions with a simple terminal app (Pressing "T" invokes the transparent mode)
However i like this litte box and use it for my HP48/28 with Christoph Gießelink's ir printer emulation as you can see:
[attachment=13202]
[attachment=13203]
You can print programs and safe them on a PC, which is for the HP28 essential.
Ralf
01-19-2024, 06:43 PM
Ralf thanks! Yup, I did with the hw serial too, but I thought there will be something one may build off his/her junkbox. Like a small pic12F1572 with an IR Rx demodulating @38kHz and an IR Led (plus an USB to serial dongle).. The critical part is the Rx chip, I have various ones here, not sure those are fast enough..