
I am using this serial expansion board to get the Serial/RS232 signal from the ultrasonic sensor to the TX/RX pins on the Raspberry Pi which requires TTL instead of RS232. Works like clockwork. I simply placed two jumpers (from the ultrasonic sensor) on pins 2 and 5 of the DB9 connector on this board (see attached image) and connected the supplied jumpers to the Pi. No other changes were required. HIGHLY RECOMMENDED.

Vilros Raspberry Pi 4 4GB Complete Starter Kit - Black Fan-Cooled Aluminum Case for Heavy-Duty Performance
12 Review

55" TV LG OLED55C2RLA 2022 HDR, OLED, dark titanium
38 Review

🌐 MCIGICM 2 Channel DC 5V Relay Module: Optocoupler Low Level Trigger Expansion Board for Arduino UNO R3, DSP, ARM, PIC, AVR, STM32, Raspberry Pi
11 Review

🎁 Ultimate BBC Micro bit Sensor Starter Kit: Keyestudio 37-in-1 Box with Tutorial, Compatible with V1.5 & V2, Gift for Kids and Adults (Microbit Board Not Included)
11 Review

36-Pack Black Rubber PC CPU/Case Fan Screws/Rivets Set for Computer
11 Review

Comprehensive 500pcs Laptop Screw Kit Set for 🔩 IBM HP Dell Lenovo Samsung Sony Toshiba Gateway Acer
12 Review

Glarks 660 Pieces Phillips Assortment Motherboard
10 Review

uxcell 3.5" HDD Screw Black 200pcs for Computer PC Case - Flat Phillips Head - 6#-32 - Hard Drive Fasteners
10 Review