HP-48GX DIY infrared to serial converter - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: General Forum (/forum-4.html) +--- Thread: HP-48GX DIY infrared to serial converter (/thread-21166.html) |
HP-48GX DIY infrared to serial converter - pito - 01-15-2024 12:00 PM Hi, looking for a hint/link on a DIY infra to serial converter project (bidirectional - TX and RX) somebody wants to share? Thanks! RE: HP-48GX DIY infrared to serial converter - Jeff_Birt - 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? Why do that when it already has a hardware serial port? RE: HP-48GX DIY infrared to serial converter - gege - 01-15-2024 03:04 PM Hello, Some information about HP48 interface (with IR circuit). A receiver (only) for IR with an Arduino. RE: HP-48GX DIY infrared to serial converter - MeindertKuipers - 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 RE: HP-48GX DIY infrared to serial converter - pito - 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.. RE: HP-48GX DIY infrared to serial converter - Hiwi - 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 RE: HP-48GX DIY infrared to serial converter - pito - 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.. |