u/ArabianEng

السلام عليكم ورحمه الله وبركاته.

هذي تجميعتي، فكرتها إنّي أبي كمبيوتر اقدر أخذه معي لأي مكان (تقريبًا) بدون ما أضطر اجيب شاشة خارجيّة.

التعديل الأساسي إني شلت الغطاء الجانبي للكرت، وركّبت مكانه شاشة ١٦ بوصة، تطلع وتنطوي مثل اللابتوب، ولما تستخدمها، تهوية الكرت تكون أفضل بكثير.

المواصفات:
- CPU: Ryzen 9 3900x
- GPU: RX 7900XTX - XFX MERC 310
- Motherboard: Asrock A520M-ITX/ac
- RAM: 64GB 3200Mhz DDR4 - JAZER
- Storage: 1TB Nvme, 1TB SSD, 10TB 7200RPM HDD
- PSU: 1000W - Thermalright TR-TGFX1000
- Display: 16” 2560x1600 120Hz IPS - LESOWN
- Case: UPSIREN MD-1

الفكرة كلّها إني أبي أداء وحرارة وقابليّة التطوير، بس بحجم جهاز تقدر تشيله معك.

اعطونا رأيكم؟ 👀

Hi everyone,

I have a Habotest HT118A multimeter and I'd like to add an ESP32 (or possibly an Arduino Nano) so that I can get its measurements onto my PC digitally.

My initial thought was to tap into the signals going to the LCD's segment display and decode the displayed measurement, rather than trying to interfere with the actual measurement circuitry.

The problem is that I don't know enough about the HT118A's internal architecture to know where/how to tap it. I found this teardown with fairly detailed PCB photos. “Credits to: Kerry Wong for these detailed images”

Does anyone recognize the IC/circuitry in this particular HT118A, or know how its LCD is driven?

Ideally, I'd like to make this a read-only tap that lets an ESP32 reconstruct whatever the meter is displaying and send it to my PC. Any pointers about where to probe on this specific PCB would be greatly appreciated.

I wanted to share a project I built for my Instrumentation & Control course.

It's a miniature process plant designed to demonstrate a complete Safety Instrumented System (SIS) protecting a pressure vessel (T-100) from both overpressure and underpressure conditions.

The system uses redundant pressure switches and implements full 2-out-of-3 (2oo3) voting logic. Rather than using a PLC, all of the safety and alarm logic was built using hardwired discrete TTL logic, relays, timers, and transistors.

The video shows both the high-high pressure trip and low-low pressure trip sequences, including alarm acknowledge/reset functions, along with a look at the control circuitry behind the system.

The project is documented in more detail on my portfolio for anyone interested in the design.

I'd love to hear any feedback or suggestions from the instrumentation community.