These day’s most computers and laptops don’t have the RS232 port installed so if you can only connect something trough RS232 you’re looking at a problem. This project comes in handy, and gets you out of the problem. It’s really simple, few parts are involved and if you do it with SMD parts it can be pretty small(like in the picture).
USB to Serial (RS232) Adapter: [Link]
This project is build around one of new Microchip PIC18F2455/2550 8-bit microprocessor with USB support. The PIC18F2455 USB core is V1.1 and V2.0 compliant and operates at 1.5 Mb/sec and 12Mb/sec speeds respectively. The microprocessor has 2048 bytes of RAM and 24K of Flash program memory, which is plenty for implementing the OBD2 controller functionality using high-level C programming language.
USB OBD2 Adapter Based on PIC18F2455: [Link]
This project allows you to log temperature under 2 operating modes: Standalone, the system works standalone and can record a max of 2 temperatures or connected to a PC’s RS232 port thus having the ability to record up to 8 temperatures. The circuit is also interfaced with an LCD that can show 2 temperatures at the same time. It also has a separate DS1302 Real Time Clock (RTC) module with over 3 months backup and supports Wayne’s NTP format for updating the clock from an NTP server. The circuit is controlled by a Atmel AT90S2313, source code and schematics are provided.
LCD Temperature Monitor: [Link]
This system is also based on the AVR Butterfly kit with two additional circuits one for ECG measurement, the other for measuring pulse oxymeter. The system can be used for monitoring ill persons or as a performance monitor for athletes. For outputting data the circuit uses RS232 or a cellphone. By using a cellphone you also get an alarm feature, so the circuit will send an alarm if any heart rate disorders appear.
Biomedical Measurement Device Measures Your ECG and Pulse Oxymeter: [Download Project] - [View Project PDF] - [Via]
As usual this is a serial programmer that works on RS232, powered also from RS232. Schematics and software are provided, the project has been tested and works for sure. Some problems you might encounter involve laptops RS232 ports which supply less voltage and current than the normal desktop computer ports, so if you plug this programmer into a laptop it might not work.
Simple JDM PIC Programmer: [Link]
