Condition: New, Brand: Unbranded, Measuring Range: 9-31 (V), The input Voltage: 12-24 (V), Voltage Measurement Error: 0.1-0. We will reply your email within 24 working hours. If you have any questions, p lease feel free to contact us via "Ask seller a question". We strive for 100% customer satisfaction! Positive Feedback is very important to us. If you have any problems about payment, please contact us via ebay message. If you do not receive your item within 30 working days since payment finished, please contact us immediately for further assistance. Monitor is the perfect application for monitoring battery operating parameters across your entire vehicle fleet. Transit time may be a little delayed because of the bad weather and customs inspection. It takes about 7 -15 working days to US about 10-30 working days to other countries. Also, the each additional item means exactly the the same color and size. ![]() Please kindly note that the c ombined shipping is not provided because the shipping fee is calculated by weight. Please comfirm that your Order address is in line with your shipping address. POLICES ShippingPaymentWARRANTY We only ship to confirmed ebay Order addresses. 2,Please allow slight manual measurement deviation for the data. Specification: Measuring Range: 9-31 (V) The input Voltage 12-24 (V) Voltage Measurement Error: 0.1-0.3 (V) Dimension: 70*40*30mm (Approx) Package Contents: 1 * Car Voltmeter Notes: 1,The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. High brightness red LED three digital display, easy to read. 0:00 / 6:18 Car Battery Monitor Review eTech Tom 37.2K subscribers Subscribe 17K views 8 years ago Trying out a car battery monitor I purchased to check out my battery in my Toyota. Designed to measure the car battery voltage value and monitor the battery voltage, make the working voltage of battery in normal use, extend the service life of and protect the battery and motor. Easy to use, just need to insert into the car cigarette lighter socket. Car Charger Volt Meter Car Battery Monitor With LED Voltage & Amps Display DESCRIPTION Features: Compact size for convenient carrying. RB7, pin 13, drives a switching transistor for the piezo buzzer.Item: 314629320626 Car Charger Volt Meter Car Battery Monitor With LED Voltage & Amps Display. Port B (RB0 to RB7) of the microcontroller is then used to drive the various LEDs, with current limiting provided via the 330Ω resistor network. This brings the voltage down to within the 0-5V range for the A/D input of the PIC16F819. ![]() The battery voltage is sensed via a voltage divider using 33kΩ and 100kΩ resistors. The incoming supply is connected via diode D1 which provides protection against reverse polarity while zener diode ZD1 provides protection from spike voltages.Ī standard 7805 3-terminal regulator is then used to provide a stable 5V to the microcontroller. This little battery monitor could easily prevent a very inconvenient failure to start! So let's describe the rest of the circuit. So don't think that a modern car will always start reliably. ![]() Some modern cars will happily crank the motor at voltages below 11V but their engine management will not let the motor start unless the voltage is above 11V. After all, most cars will start with no troubles, even though the battery voltage might be a touch below 12V, won't they? Well, no. These two LEDs are backed up by the piezo chime which beeps for voltages between 11.5V and 12V and becomes more insistent for voltages below 11.5V. LED6 covers from 11.5V to 12V while LED7 comes on for voltages below 11.5V. LED4 covers 12.5V to 13V while LED5 covers 12V to 12.5V. LED2 indicates for voltages between 13.5V and 14V while LED3 indicates between 13V and 13.5V. ![]() The topmost LED, LED1, comes on for voltages above 14V which will occur when the battery is fully charged. There are seven LEDs in all, giving a good range of voltage indication. The circuit is based on PIC16F819 18-pin microcontroller which has an analog-to-digital (A/D) input to monitor the battery voltage and outputs capable of driving LEDs directly, to keep the component count down.
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