The project has not advanced further than the soft power switch and display.
- Project Status: In-Progress (Stalled)
- Started (Year): 2022
- Last Updated (Year): 2023
Blog Posts
Soft Latching Power Switch Revisited
This week, I have some updates revolving around the Soft Latching Power Switch, that I last wrote about eight years ago. I finally returned to the project and now have it working as I intended. I also have made some changes to the Dual Volt Amp Meter’s Desktop software. I believe I may now have…
Microchip AR1100 Resistive Touch Screen to USB
I’m currently working on a project similar to what Rune Kyndal did, which is putting a Raspberry Pi inside an old HP 95LX case. You can see Rune’s project on HACKADAY.IO. I sourced a 800×320 screen from BuyDisplay.com, that is a good match for the original dimensions of the HP 95LX display. Arguably, the screen…
Soft Latching Power Switch
The Raspberry Pi ON/OFF Power Controller that I looked at from Mosaic Industries, Inc. does a good job at 5 VDC but I need the circuit to be able to switch LiPo batteries which have a voltage range of between 2.7 and 4.35 VDC between discharged and fully charged. I looked for dual MOSFET devices…
INFO: The following contains the start for a proper project page. When this project is revisited, it is planned to build out the rest of this page.
Overview
This project is a recreation of Rune Kyndal’s project featured on HACKADAY.IO. The project removes the electronics from an old HP 95LX DOS handheld PDA and adds new electronics with a Raspberry Pi Zero as the main component. My design is a bit different as I want the screen to be the same format as the original HP 95LX and to include a working touch screen and a real time clock.
Parts List
| ID | Description | Part Number/Value | Package | QTY | Supplier | Item # | $ Each | $ Total |
|---|---|---|---|---|---|---|---|---|
| LCD1 | 800×320 LCD Resistive Touch Screen | 1 | BuyDisplay | ER-TFT046-1-5086-2469 | 19.73 | 19.73 | ||
| PI1 | Raspberry Pi Zero 2 W | 1 | Digi-Key | 2648-SC0510-ND | 15.00 | 15.00 | ||
| MOD1 | Resistive Touch Screen to USB Mouse Controller – AR1100 | 1 | Adafruit | 1580 | 9.95 | 9.95 | ||
Build Steps
Soon steps will be added which have taken to create this project. This is still being worked on.
References
- Kyndal, Rune. “HPI95LX.” Hackaday.io, 19 June 2020, https://hackaday.io/project/172230-hpi95lx.
- tom-2015. “Tom-2015/RPI-AR1100: Calibration Program for the AR1100 on the Raspberry Pi.” GitHub, 2 May 2015, https://github.com/tom-2015/rpi-AR1100.
3 replies on “HP 95LX Raspberry Pi”
I just came across this page.
i had no idea you where working on a revisit of my HPi95LX
let me know if i can help
Good luck.
Rune
I just came across this site,
i had no idea you where working on a re-visit of my HPi95LX
nice looking screen, i like the format..
let me know if i can help
Rune
Rune Kyndal, Thanks for the note. Unfortunately, I have had several other projects catch my attention and I have not returned to the project. Still on my list of things to get done someday. Your project was a great inspiration. The screen has the same height and width of the original HP Screen, which does not give me room for audio speakers.