High voltage probe for multimeter

High voltage probe for multimeter

High voltage probe for multimeter


High voltage probe for multimeter


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Using ultrasonic sensor without arduino

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Using ultrasonic sensor without arduino Parts list: IC 555 IC KA2284 LED(5pcs) Ultrasonic receiver & transmitter Resistor 1K Resistor 2.2K Resistor 10K Resistor 100 ohm Potentiometer 10K (2pcs) Capacitor 10uF (4pcs) Capacitor 3.3nF Transistor 2N2222 Buzzer There are 2 ways to using Ultrasonic sensor without microcontroller: First way, the buzzer turns ON when you put your hand near the sensor   Second way the LED bar show you the distance level between the sensor and the objects. Video: More information in the video
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Electronic load using Op-Amp IC 358

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Electronic load using Op-Amp IC 358 In this circuit i using IC 358 and some few components to make a simple constant load.  The trick here is connecting a dc voltmeter to the non-inverting input of the op-amp to preset the current before connect it to the battery or the super cap. under test. For more explanation you can watch the video below. Parts list: LM358 : https://www.banggood.com/custlink/Dvv3hO51Df High power resistor: https://www.banggood.com/custlink/K3GvYjHwRm Digital DC Voltmeter: https://www.banggood.com/custlink/3vmDYL5TDU Copper board: https://www.banggood.com/custlink/3KDDmMsPSc MOSFET IRFZ44N : https://goo.gl/35n5Tb   Potentiometer 100K : https://goo.gl/dKnWCj Resistor kit (10 Ohm): https://goo.gl/TgSaff Heatsink: https://www.banggood.com/custlink/D3KGdOSmzf   Circuit:   Gerber file: Download the Gerber file from here:  https://drive.google.com/open?id=1Lx8xjfkyYPvvzAbA0ponFBYBTQDqrMvU Video: For more explanation you can watch the video below 
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Arduino 220V AC Power meter using PZEM004T

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Arduino 220V AC Power meter using PZEM004T Library : https://github.com/olehs/PZEM004T Part list: Arduino board LCD 16x2 PZEM004T module Resistor 220 ohm Potentiometer 10K Video:  CODE: #include <SoftwareSerial.h> // Arduino IDE <1.6.6 #include <PZEM004T.h> #include <LiquidCrystal.h> LiquidCrystal lcd(7, 8, 9, 10, 11, 12); PZEM004T pzem(2,3);  // (RX,TX) connect to TX,RX of PZEM IPAddress ip(192,168,1,1); void setup() {   Serial.begin(9600);   pzem.setAddress(ip);   lcd.begin(16, 2); // lcd rows and columns    } void loop() {     float v = pzem.voltage(ip);   if (v < 0.0) v = 0.0;   Serial.print(v);Serial.print("V; ");   lcd.setCursor(0,0);   lcd.print("V= ");   lcd.setCursor(2,0);   lcd.print(v);   float i = pzem.current(ip);   if (i < 0.0) i = 0.0;   Serial.print(i);Serial.print("A; ");   lcd.setCursor(9,0);   lcd.print("A= ");   lcd.setCursor(11,0);   lcd.print(i);   float p = pzem.power(ip);   if (p < 0.0) p = 0
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