PIC Microcontroller

# This version uses a double sided PCB. Dimensions are approximately the same as the original version. # Removed the second push button switch and components for the RS232 serial interface. # Added 22K resistor between MCLR input and Vdd. This eliminates the need for a jumper on the ICSP header in normal operation. (If you use a 12F683 you can omit this resistor as well since it has an internal pull-up) ..

The pins RA3 to RA0, are used as outputs driving each column LED. The pins RB0 to RB7 are used as outputs driving signal for each column LED. The 74HC154 (Decoder 4 to 16) is the chip that decodes the signal into a binary digit dekaexapsifio. In the left figure all the pins of the door at a reasonable RA 0 (Low), in which case only the output 0 of the 74HC154 decoder is logical 0 and the others at logic 1. Therefore only the transistor TR1 conducts and powered on the.....

ezPIC is low cost serial port programmer for PIC microcontroller and I2C EEPROM. The programmer does not need external power supply and it takes all necessary power and signal from RS232 Serial Port. No external power supply required High quality 3M ZIF socket for easy insertion and removal of devices Software upgradeable for future PIC Microcontrollers Can program most PIC and I2C EEPROM devices In-Circuit Programming capability LED indication of Active.....

Our present car controller runs on a single PIC16F870 micro and provides functions for remote door locks, headlight reminder, and car finder. It is constructed using wire-wrap to allow for future expansion and is mounted using Velcro on the passenger side of the center console. The downside of this design is that changes to the system require a lot of work for removal, rewiring, reprogramming, and reinstalling. It could also be stolen which would be a major bummer -.....

The circuit in Figure 1 is a keypad interface that solves this problem by using an ultralow-power microcontroller. The circuit typically consumes 100 nA while awaiting a key press and consumes a maximum of only 2 µA if all keys are stuck or held down. An added bonus of the circuit is that it requires no crystal...

The popularity and easy access of RS-232 ports lend them to many communication projects. You can use a port as is” or as a tiny parallel port when the exchange uses only control lines. Before the asynchronous serial-data transfer between two devices can take place, you must ensure that both devices are configured to the same data format and transmission rate. Usually, the OS utility or application program on the host computer performs this task, which the OS or a.....

GPS trackers as GPS vehicle tracking and person monitoring tracking can be used in a good way but sometimes they are used in bad way. These tracker units monitor the exact location of you, and then deliver that information to a second part. If you don’t want your location is track able then GPS jammer will take care of that...

Programming is very straight-forward when this programmer is used in conjunction with the easy to use DOS-compatible software. No requied power supply...

This project is a self-contained serial terminal using a PIC16F84 microcontroller chip, an inexpensive LCD character display, a keypad, and very little else. It is full-duplex, meaning keypresses cause RS-232 output, and RS-232 input makes characters appear on the LCD. If you connect the RS-232 output to the input you can see the keys as you press them, without connecting to anything else (thats called looping back)...

Flash-back to the 60's with this 5 channel unit with up to 100 watts per channel. This unit uses a PIC16F84 with an 8 bit A/D. The signal from both stereo channels is combined and digitized. Each of 5 frequency bands is processed using a 16 point FFT. Then the level of each channel is output as PWM (pulse width modulation) to a set of solid state relays...

This is a gas detecting circuit capable of sensing many different types of gases. The sensor used is the GH-312 and from the datasheet it is capable of sensing gases like smoke, liquefied gas, butane and propane, Methane, alcohol, hydrogen, etc. I've used a 9V battery for this project because the sensor requires a 9V input. The output when the sensor is triggered is always 5V which is perfect for a direct connection to any microcontroller. Although I've used a 9V.....

The WWVB signal is broadcast as a 60 kHz carrier that is AM modulated with a time code frame that is updated once per minute. The data rate is one bit per second. Along with time code information, the data frame also contains synchronization bits, calendar data, UT1 correction, leap year, and leap second data. The clock design presented here only decodes the time data and daylight savings correction data. The software could easily be modified to include decoding of the.....

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The basic idea comes from the AN592 Microchip application note: "Frequency counter using PIC16C5x". where you may find a simple software wich implements a frequency counter using a PIC microcontroller.I wrote a specifically designed software to improve the counter resolution, to handle the IF mode and value by means of an operating menu, to decode and edit the read frequency on an LCD display. The result was a simple and effective device, equipped with a free software.....

PicCon is a PIC microcontroller based radio controller designed for hidden transmitter hunting. When combined with a radio transmitter, it will produce tone sequences and Morse code messages at user-programmed times. It is completely field programmable via DTMF tones, utilizes EEPROM for all programmed options so they are remembered when power is removed, and is quite compact...

This project creates a simple but valuable a wireless remote controller. He has as many as 6 channels (a rare feature for remote business) and transmits encoded MM53200 , UM3750 or UM86409 . Of course you can omit the button and make such a 2-channel remote control. It 'a pairing perfect for Nutchip , and is easy to build home-why do not you use special components: even the battery is a common 9-volt battery found in all supermarkets. This diagram illustrates a remote.....

Almost any 2x16 character LCD module with Hitachi HD44780 controller chip will work. The LCD pin numbers on the schematic are not valid for all LCD modules. Please check the actual signal names on your particular LCD module. The selected DFCW frequency offset will be added to the output frequency when the DFCW input is grounded. This input has a weak pull-up in the PIC. The encoder inputs also have internal pull-ups in the PIC. The switches "LOCK", "DFCW" and "CAL" are.....

If the piclist is an any indication the 16f877 seems to be the new favorite hobby microcontroller, a position that used to be occupied by the 16f84/16c84. Compared to is older brethren the 16f877 has much more to offer at around twice the price. As for all Microchip controllers the datasheet (pdf) and the MPLAB assembler IDE are available for free. (Microchip keeps changing its website, so when these links turn out to be invalid you might have to look around a little.)..

The circuit diagram is shown to the right. You can get a larger version or a PostScript version if you prefer. The design is based around a Microchip PIC16F628A microcontroller. At the time of writing, this device is available for less than one pound from (among others) Crownhill Associates. All the work, including colour video and synchronisation signal generation, is done in the microcontroller, and so there are no other active components. Purists who contend that the.....

Robot Beacon is a rotating light. We have called it Robot Beacon as it has been designed as an addition for a robot, but it can be used for many applications. It can be used as a mast-head beacon on a boat or as an "all-round" warning light on a bike. Robot Beacon uses a PIC12C508A OTP (One Time Programmable) 8-pin microcontroller...

Build a simple real-time controller with PIC16F84 running at low power X-tal 32,768Hz. Daily scheduler for 6-channel resided in 64-byte EEPROM can easily be preprogrammed using Nigel PicProg. RTC2.C provides user programmable set current time without the need of recompilation. Fixed bug on minute conversion!..