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  1. Raja Vigneshwaran

    nRF51 BMD200 using IAR IDE and HX711 to calculate weight

    Hi, This is the first time I am using nRF51 BMD 200 , and I need to calculate weight using HX711 and transmit the data to a bluetooth device. I have finished the hardware setup and having problem with the code , can any one guide me with the program? Regards, Raja Vigneshwaran.
  2. Raja Vigneshwaran

    ESP8266 arduino coding

    #include <ESP8266WiFi.h> const char* ssid = "Rjviki"; const char* password = "2444666668888888"; int ledPin = 12; int ledPin1 = 4; WiFiServer server(80); void setup() { Serial.begin(115200); delay(10); pinMode(ledPin, OUTPUT); digitalWrite(ledPin, LOW); pinMode(ledPin1, OUTPUT)...
  3. Raja Vigneshwaran

    ESP8266 v7 powering up by external source

    Hi ! In my previous thread i have some doubts over Home Automation in using relays and I have solved them , right now I am implementing ESP8266 v7 module to control home appliances so I need to Power it up using an 12v adapter and regulated into 3.3v for the ESP but the circuit is not...
  4. Raja Vigneshwaran

    Relay switching

    Thanks guys , atlast I was able to finish the circuit using FDT439NCT N Channel MOSFET
  5. Raja Vigneshwaran

    Relay switching

    Okay but what about the Source and Drain of the MOSFET ?
  6. Raja Vigneshwaran

    Relay switching

    Okay if that so , I should connect my MOSFET at the Emitter of the Transistor Q1 ? Am I Right ?
  7. Raja Vigneshwaran

    Relay switching

    To Steve, Actually there wasnt any transistor in the module he was using and In the tutorial he said that 3.3 volt will be enough to turn this 5Volt relay ON . And About your circuit diagram , where should I connect the Relay ?
  8. Raja Vigneshwaran

    Relay switching

    I have a doubt with this below link , This guy is using 3.3volt digital output voltage from the ESP8266 module to turn ON the coil of the relay which has a coil voltage of 5V . How is it possible ? Any explanation ? Link below / https://openhomeautomation.net/control-relay-anywhere-esp8266/
  9. Raja Vigneshwaran

    Relay switching

    I have ordered for FDT439NCT N channel MOSFET , mean while is there any other way that i could make a switch for this issue , i have a suggestion of using ULN2003 for switching purpose . Do you have any other suggestions ?
  10. Raja Vigneshwaran

    Relay switching

    I will reverse bias the diode now and relay is a 12volt coil voltage I am using IRF840 N Channel MOSFET Can you suggest any Logic Level MOSFET that I could use here < TTL or any other Logic >
  11. Raja Vigneshwaran

    Relay switching

    ya I will add Diode in Forward Bias in Circuit , If MOSFET needs Gate voltage as Source Voltage then I must use a 3.3 volt relay for this cicuit ? Or is there any other alternate for this problem ?
  12. Raja Vigneshwaran

    Relay switching

    please send me the correct circuit diagram , If this is wrong
  13. Raja Vigneshwaran

    Relay switching

  14. Raja Vigneshwaran

    Home Automation

    I am constructing a Home Automation using ESP8266 Wifi Module and making a relay circuit on my own . But I am getting problem with the switching process in relay I used BC107 transistor but it doesnt get required Current to switch ON and I used IRF840 N Channel MOSFET but it requires Negative...
  15. Raja Vigneshwaran

    Relay switching

    Hi, I am constructing a Home Automation using ESP8266 Wifi Module and making a relay circuit on my own . But I am getting problem with the switching process in relay I used BC107 transistor but it doesnt get required Current to switch ON and I used IRF840 N Channel MOSFET but it requires...
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