Battery Circuit Diagrams

State Of Battery Indicator Schematic Circuit Diagram

Battery Indicator Functionality and Importance

A battery indicator, also referred to as a battery gauge, serves the purpose of providing information about the state of a battery, typically through a visual representation of its charge level. This feature is especially crucial in the context of battery-electric vehicles. Numerous battery-operated devices come equipped with an LED indicator, offering a clear display of the battery’s status. When the battery is nearly depleted, the LED may exhibit a flickering pattern. The described circuit allows for the integration of this capability into devices lacking an indicator.

Circuit Description for LED Battery Indicator

The circuit operates based on the voltage drop across D1 (LED), typically around 2 V depending on the LED type. This voltage is directed to the input of a discrete differential amplifier, T1-T2. When the base voltage of T1 is lower than that of ULED, it activates, initiating the charging of C1 through R1. As the potential across C1 rises, T3 turns off, allowing T4 to conduct. Consequently, D1 turns off and remains in this state until Ci is discharged. Assuming the base voltage of T1 remains lower than that of the LED, the cycle repeats. This cyclic process causes the LED to continue flickering until the base voltage of T1 surpasses that of the LED. At this point, only T1 and T3 are active, with T4 off, resulting in the continuous illumination of the LED.

State of battery indicator Schematic diagram

The setting of preset P1 determines the point at which the LED begins to flicker. The frequency at which it flickers depends on the supply voltage and the value of C1. This means that the frequency may be changed by altering the value of this capacitor. The value of Rv determines the current through D1 and, thus, the brightness at which it lights. In practice, the LED and RV are often already present in the appliance. The LED indicator at the top of the camera is critical to determining the status of your camera. This is what we use to verify that it is recording or if it is in need of attention.

 

LED indicator status:

  • Power on: Green on
  • No SD card: Solid Red
  • System Breakdown: Red flash/1 sec.
  • Battery Low: Red Flash/10 sec.
  • Firmware update: flash/1 sec.
  • Hardware Reset: flash 3 times
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