1/17/2024 0 Comments Arduino low battery indicator![]() ![]() High capacity and deep-cycle rechargeable batteries are all around us. But it will help you succeed in certainly electronic projects.Build this simple ATtiny-based battery voltage indicator to help avoid your high power batteries from becoming flat or damaged. The actual voltages will depend on temperature conditions and battery type, wet cell, gel cell etc.Īlthough the circuits are is not the same. Each LED represents an approximate 25% change in charge condition or 300 millivolts, so that 3 LEDs indicate 75%, 2 LEDs indicate 50%, etc. Calibration can be done by adjusting the 2K potentiometer so that all four LEDs illuminate when the battery voltage is 12.7 volts, indicating full charge with no load on the battery.Īt 11.7 volts, the LEDs should be off indicating a dead battery. The LEDs will illuminate when the voltage at the negative (-) input exceeds the reference voltage. In the circuit below, a quad voltage comparator (LM3914) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery.Ī 5 volt reference voltage is connected to each of the (+) inputs of the four comparators and the (-) inputs are connected to successive points along a voltage divider. The LED1 is normal because lower current pass through its.Ĭircuit 6# 12V Lead Acid battery level monitor When voltage is 15V up LED1,LED2,LED3 all light up. Because of volt reed source that 15V have current flow through R4 and ZD2 go to encourage pin B of Q2, It make Q2 work LED3, then stick bright. But if level voltage of power supply 15V exceed make LED 3 both of stick bright. Because voltage that 11V exceed have current flow through R1 and ZD1 go to encourage a pin B of Q1 make Q1 work LED2 bright. If voltage 11V more than but 14V not exceed make LED1 the red and LED2 green stick bright. My son is testing this circuit again and modify this new. Thank very much Denis this circuit error. Which will the level volt normal, if level voltage a little 11V more make LED1 red stick bright. The work of the circuit be this circuit was fixed come to give a temple volt usual that about 11V-14V. Which be simple complicated can see that the circuit has will LED keep for display arrive at 3 step. This circuit is simple battery level indicator circuit. The Resistor values of Potentiometer VR1-3 are determined by the type of LED, when we used MV 50 LEDs many resistant, by steps of 2K for the 2V, and drain current (series circuits) in all three LED lights on the 5mA, the Chain LED can be extended, But the rapid increase in the drain current and the first LED in the current supply.Īs figure below we test this circuit on breadboard with 3V for first LED1, 6V for second LED2 and 9V for third LED3.Ĭircuit 5# Battery voltage level indicator circuit We use a variable resistor(Potentiometer) with 3 unit only, making this the circuit cheap and easy. When see in the below circuit is very simple. Today we look at the concept of a simple level indicator circuit, which are built to be very small, can be displayed with LED 3 step. Circuit 4# Simple three-step level indicator This circuit may is is simple good may advantage for friends, please sir. When Zener Diode quietly enhance the value Vz. The circuit on the right will testify to read the value is Bar Graph. ![]() And Vz of Zener diode +VLed should use RS for LED one by one. By in each the circuit LED stick bright when V+ goes up to arrive at Breakdown voltage. The Zener Diode, Resistor, and, LED as a result can show already. Today we come to see Voltage-Level Indicator in model easy most. But it might make circuits great work was complete. Simple Voltage Indicator using LED and Zener diode Since the LED can tolerate 20-30mA, R1 provides more than right current limiting.Ĭircuit 3# Simple Voltage Level Indicator using Zener diode Light-emitting diodes(LED) LED display is the indicator. In the circuit uses just two LEDs and one resistor only. It is suitable for showing to an audio signal or CW tuning indicator. You are meeting a tiny visual zero beat indicator circuit. See look like of both LED display in video below:Ĭircuit 2# Tiny visual zero beat indicator circuit The LED1 goes out because it gets reverse polarity. But not end, the current in C1 discharges to LED2. Then, we turn off, NO the current to the output. Now, C1 has the current full and there is less Leakage current. Until C1 is fully charging, LED1 will go out. If we turn on, the current flow through R1 to LED1, it briefly flashes as C1 begin to charge. In the circuit, there is the SPDT switch-S1. But LED2 will briefly flash after that it goes out, too. Then, we turn off S1 to “OFF” to do not use the circuit.
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