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Low-Voltage Cutoff Switch

View CJKIT-20462: Low-Voltage Cutoff Switch Kit Soldering Iron

CJKIT-20462: Low-Voltage Cutoff Switch Kit Soldering Iron

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Jameco Kitpro
Jameco Part no. 2161369
Manufacturer JAMECO KITPRO
Manufacturer no. CJKIT-20462
Catalog 142 , page 162
Pricing & Availability

$14.95

# of Unit Price
1+ $14.95
5+ $12.95
  • Availability:Ship  3 Days ARO 

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Low-Voltage Cutoff Switch Kit


Experience Level: Intermediate

Project Overview: A microcontroller-based voltage cutoff circuit, currently in use on several motorcycles. It is designed to monitor the voltage level for the battery, and activate an accessory circuit when the level is sufficiently high. If the level drops below a calibrated level, the accessories are cut off. Check out what others are saying about the Low Voltage Cutoff Switch project build!

This circuit has 4 connections to the motorcycle:
* ground (from battery or chassis)
* battery +12V
* signal +12V (from the ignition circuit or a headlamp / tail light)
* switched +12V output from the relay

Accessories will be wired to the switched + ground connection. The signal line provides "house" power, drives the microcontroller, and will be measured to determine whether to activate accessories. This line will draw very little current and will not be used to operate the relay (~160mA draw). The relay will be driven from the +12V battery source, and will operate the switched +12V line.

Please note: Due to inventory packaging methods, you may receive extra components for some products. Some items may not be sold at Jameco and will need to be purchased separately, please review the materials list below. You will also need programming experience to upload code to the PIC MCU.

Required Tools:

  • Soldering iron
  • Solder
  • Clipping tool for trimming leads
  • Epoxy glue
  • Optional: ABS plastic enclosure (recommend: P/N 141832)

    Kit Includes:

    Part No.
    Qty.
    Description
    37197
    1
    IC socket, 14-pin, machine tooled
    178597
    10
    Transistor, 2N3904, NPN
    51262
    1
    IC, 7805T, TO-220
    333201
    10
    LED, Hi-efficiency green, 565nm
    691104
    10
    Resistor, 1/4 watt, 10k Ω
    690988
    10
    Resistor, 1/4 watt, 3.3k Ω
    690785
    10
    Resistor, 1/4 watt, 470 Ω
    691024
    10
    Resistor, 1/4 watt, 4.7k Ω
    148583
    1
    Relay, enclosed style, SPDT, 12VDC, 40A
    149948
    1
    Switch, pushbutton, tactile, SPST
    198952
    10
    Capacitor, radial, 47µF, 35V
    151918
    1
    Fuseholder, in-line
    10373
    1
    Fuse, AGC fast acting
    223781
    1
    IC, MCU, PIC12F675-I/P
    645677
    1
    Prototype board, 3.5" x 2.5"
    ---
    1
    Instructions

    Club Jameco Project #20462

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