ESP8266-01 hc04 ultrasonic distance sensor with code with javascript+ webserver

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Комментарии
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Connected hc04 to 5v and it worked fine. got garbage when connected with v3.3.
dont know how long esp chip can last with echo pin giving 5v

phasefour
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Here is the trick :

#define echoPin 2 // Echo Pin > 10K > Base(NPN), Colector(NPN) > +3.3v, Emiter(NPN) > ESP8266 (2)
#define trigPin 0 // Trigger Pin direct to ESP8266 (0)

akotlia
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Hi, Does HC04 work on 3.3v ? I tested with Arduino providing 5 V it worked, but its not working with 3.3v supply?
Since ESP8266 works on 3.3V I was wondering the if it may work standalone with ESP? Appreciate your help on this!!

SelfMadeBharat
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Is it necessary to use a voltage divider between trigger/echo and GPIO0/GPIO2?

JWitto
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Is it sending data to cloud server (like thingspeak)? What is the role of esp 01 in this schematic?

swapnilmathur
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Hi, can u show the schematic with arudino sir ?

fathoniekapradipta
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Hi, can u show the schematic with arudino sir ?

fathoniekapradipta
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