Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download LM3914 battery indicator variable voltage meter
Transcript
LM3914 battery indicator variable voltage meter LED display DIY Kit Introduction This is a LM3914 battery indicator DIY kit, it can measure and display battery capacity up to 10 steps with 4 colors 1. Measure up to 18V battery 2. Temperature Range: -40F ~ 185F 3. Connection: Pin+ : Battery + Pin- : Battery – 4. 10 steps for colors: RED, YELLOW, GREEN and BLUE 5. Can measure 3.7V, 7.4V. 11.1V or higher Lithium battery http://www.eimodule.com http://www.eimodule.com EIM392 Components List Item Reference 1 2 3 4 5 6 7 8 9 U1 U3 RP1 R3 R2 R1 R4 J3 J1 Part Description LM3914 10 steps LED segment 50K Potentiometer (3296) 2.4K DIP Resistor 27K DIP Resistor 510R, DIP Resistor 7.5K, DIP, Resistor For cables 2PIN, 2.54mm Pitch LM http://www.eimodule.com 1) Function of the J1: Display Module Selection: A. If J1 is close, BAR display mode B. If J1 is open, DOT display mode. 2) R2, R3 and R4 are used for step value. R1 is for LED current. Please refer to the specification of LM3914 for more information. http://www.eimodule.com EIM392 Layout 1. Top Layer 2. Bottom Layer http://www.eimodule.com Assembly Guide 1. Solder the 10 steps LED segment first Pay more attention to this direction of LED segment http://www.eimodule.com 2. Solder the LM3914 http://www.eimodule.com 3. Solder the potentiometer, 4 resistors and Jumper 4. Solder the cables. The red cable is soldered on the pad marked with “+” and the black cable is soldered on the pad marked with “‐” http://www.eimodule.com Calibration You have to calibrate this battery capacity before this module is used for measurement 1. Use a power supply to supply this indicator with the fully charged battery voltage. You have to use a higher voltage source for the battery you want to measure, for example: 1) To measure 3.7V Lithium battery, please use a 4.2V source to calibrate this indicator 2) To measure 7.4V Lithium battery, please use a 8.4V source to calibrate this indicator 2. Adjust the 50K potentiometer to make all LED segments on. http://www.eimodule.com
