Battery Indicator based on PIC18f452


Posted on Feb 7, 2014

If both the reading are high then the diode is short. If both the readings are Low then the diode is open. If any of read pins are low and the second is high then the diode is good. This concept can be easily extended to test a transistor by realizing that a transistor consists of two PN junctions: one between the base and the emitter (BE junction


Battery Indicator based on PIC18f452
Click here to download the full size of the above Circuit.

), and the another between the base and the collector (BC junction). If both the junctions conduct in only one direction, the transistor is normal, otherwise it is faulty. We can also identify the type (PNP or NPN) of the transistor by considering the direction of the current conduction. Three I/O pins of a microcontroller are required to implement the testing algorithm for a transistor. 2. Set D1 High and read D2. If D2 is High, EB junction conducts, otherwise not. Set D3 High and read D2. If D2 is High, CB junction conducts, otherwise not. Now, if only the BE and BC junctions conduct, the transistor is of NPN type and is working fine. And, if only the EB and CB junctions conduct, the transistor is still normal but the transistor type is PNP. All other cases (like EB and BE both conduct, or BC and CB both not conducting, etc. ) indicate the transistor is not good. This project gives an idea that how we can interface the keypad and & Segment Display with PIC Microcontroller. When we press any digit from keypad, it will be displayed on the seven segment display. By pressing the # key, digit will increment and by pressing the * key, displayed digit will be decremented. 7 Segment Displays are of two types. Common Anode and Common Cathode. In Common Anode type display, Anode of each segment of display is common and we connect it to the Vcc or +5V. Whereas, cathode of each segment is available on the physical pins of 7 segment...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    100 Mhz converter
    Glitch-free-turbo-circuit
    Carrier-Current Baby-Alert Transmitter Circuit
    FSK Demodulator
    ambient noise cancelation microphone circuit will work
    Harnessing the sun with solar garden light
    Project: PC Power-on Combination Lock? |? O J Ford
    Wien bridge sine wave oscillator circuit composed of LM101A
    RF amplifier and filter for 144 MHz



    Top