wyatt/escape_gallery_obsidian_vault
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

vault backup: 2026-07-11 16:59:05

Browse Source
This commit is contained in:
John Lyon-Smith
2026-07-11 16:59:05 -07:00
parent b0318f13ae
commit ecb462a16b
82 changed files with 1970 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
Projects/Electronics/Ribbon Cable Tester.md Normal file
View File

@@ -0,0 +1,42 @@
## Goal
Build a handheld device that can be used to test the 8 strand ribbon cables that connect the MRFC522 readers to the RPi breakout board.
## To Do
- [x] Design & print ribbon cable tester case bottom half 🔼 ➕ 2024-05-15 ✅ 2024-06-07
- [x] Design & print ribbon cable tester case top half 🔼 ➕ 2024-05-15 ✅ 2024-06-08
- [x] Design & print ribbon cable tester battery door 🔼 ➕ 2024-06-08 ✅ 2024-06-08
- [x] Assembly the unit ➕ 2024-06-10 ✅ 2024-06-10
## Parts List
| **Part Code** | **Type** | **Value** | **Mfg Code** |
| ------------- | ------------------ | ----------- | ---------------------------------- |
| R1 | Resistor | 68 to 75 KΩ | |
| R2 | Resistor | 1 KΩ | |
| R3 | Resistor | 1 KΩ | |
| R4 | Resistor | 1 KΩ | |
| R5 | Resistor | 10 KΩ | |
| R6 | Resistor | 100 Ω | The ratio of R6:R7 is 1:3.3 (0.30) |
| R7 | Resistor | 330 Ω | |
| C1 | Ceramic Capacitor | 0.01 µF | 104 |
| C2 | Ceramic Capacitor | 10 µF | 106 |
| RV1 | Potentiometer | 100 KΩ | 104 |
| U1 | Integrated Circuit | LM555 | |
| U2 | Integrated Circuit | CD4017 | |
| D1 - D8 | 5mm LED | Red | |
| D9 - D16 | 5mm LED | Green | |
| D17 | 5mm LED | White | |
| J1 - J2 | IDC Socket | 8 pin | |
| | | | |
## Build Notes
- Overall current draw is 0.03 A so power is ~0.27W
## References
- [This is a good tutorial](https://www.nutsvolts.com/magazine/article/led-chaser-sequencer-circuits), but there is no capacitor to pin 5 of the LM555 as in all the other articles, which seems wrong.
- [LM555 datasheet](https://www.ti.com/lit/ds/symlink/lm555.pdf?ts=1715218052822&ref_url=https%253A%252F%252Fwww.google.com%252F)
- [4017B datasheet](https://www.ti.com/lit/ds/symlink/cd4017b.pdf?ts=1715285377632&ref_url=https%253A%252F%252Fwww.google.com%252F)
- The best [LM555 tutorial](https://www.nutsvolts.com/magazine/article/using-the-555-timer-ic-in-special-or-unusual-circuits). It actually works.