Wireless Vehicle Thermometer

Wireless Vehicle Thermometer videos

Gadget or tragic? PIC Microcontroller Project 25 years on, I decided to take up an old hobby electronics. Whereas Z80 microprocessors were the leading edge 25 years ago, today, microcontrollers are the chip of choice. So I needed to define a simple project to grown my knowledge from zero. I took an analogy on a radio controlled vehicle and decided that was it. I would re use an ancient joystick at one end and use even more ancient fischertechnik from my childhood days to put together a joystick controlled vehicle. At the joystick end I use 16F873 microcontroller to read the voltages on the joystick and crunch the values down to a command. for each motor I have forward, backward or stop plus a pulse width modulated power rating from 0 to 100 . The command is assembled in ASCII and then sent down the wire at 1200 baud (wireless to come shortly, hopefully) . At the fischertechnik vehicle end of the wire, a 16F627 microcontroller de serialises the message, checks the header and payload, and if it checks out OK, sets the motors directions and speeds. This is repeated several times each second. For the pulse width modulated speed control, I use a second thread kicked off 5000 times a second to prvide the pulses. An L293D dual bridge driver powers the motors at about 7v from the 4.8v logic levels of the 16F627 chip. There are about 350 lines of assembler on the vehicle and about 250 on the joystick, most of which is defensive programming, error checking and trace. I take the NASA approach to things like this, something is

Sainik Lieutenant Suraj Dutt has been in the Indian army for years. He takes leave to meet his father, Retired Colonel Yashpal Dutt and sister Minni. On the way, he rescues some school children held hostage by a group of armed men. The media turns him in a hero and he meets Alka and both fall in love with each other. Alka and Suraj get married and shortly he leaves his pregnant wife to re join duty at the border. His father soon gets the news that he is missing, believed dead. What will happen now?

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Wireless Vehicle Thermometer headlines

RFID News Roundup
The R151 tag, which incorporates the same 433 MHz active RFID technology underlying all of RF Code #39 s RFID tags and sensors, has a five year battery life, and monitors and reports the temperatures observed by a digital thermometer embedded at the end of