Hi everybody
hope the post is in the right place, sorry if it's wrong.
I made a DIY project to water my garden automatically from this post: (the garden is 90 Km away from my house).
https://www.instructables.com/id/WATERING-SYSTEM-INTRODUCTION/
almost everything is OK but one thing, sometimes when the relay state changes, the LCD shows weird characters and sometimes it just got stuck 1 in two attempts and sometimes continuously,
I did some modifications which I found from the web: like:
A) putting flyback diode (1N4002) and capacitor (100 nF) in to the water pump leads to control the back current and brushes noises,
B) one 2L1C filter from this post (https://forum.allaboutcircuits.com/...-surge-and-interference-of-uc-5v-and-gnd.659/) for the Arduino,
C) two 50 uH inductors for the water pump supply one for vcc and one for gnd,
D) three 33 uH inductors for VCC and gnd and SCL leads of display,
E) start the water pump in 2 state switch with 2 channel relay to make sure the inrush current (stall or locked rotor current) is avoided, first in a way with 10 ohm resistance for 1 s and then start the primary circuit.
after these modifications the problem just happens 1 in 10 times, but for watering planets automatically in case of 90 Km far away, it is necessary to work very precisely without any problem.
I do not have any scope meter or something, I cannot afford any solid state relay, please help and save the project. TNX.
hope the post is in the right place, sorry if it's wrong.
I made a DIY project to water my garden automatically from this post: (the garden is 90 Km away from my house).
https://www.instructables.com/id/WATERING-SYSTEM-INTRODUCTION/
almost everything is OK but one thing, sometimes when the relay state changes, the LCD shows weird characters and sometimes it just got stuck 1 in two attempts and sometimes continuously,
I did some modifications which I found from the web: like:
A) putting flyback diode (1N4002) and capacitor (100 nF) in to the water pump leads to control the back current and brushes noises,
B) one 2L1C filter from this post (https://forum.allaboutcircuits.com/...-surge-and-interference-of-uc-5v-and-gnd.659/) for the Arduino,
C) two 50 uH inductors for the water pump supply one for vcc and one for gnd,
D) three 33 uH inductors for VCC and gnd and SCL leads of display,
E) start the water pump in 2 state switch with 2 channel relay to make sure the inrush current (stall or locked rotor current) is avoided, first in a way with 10 ohm resistance for 1 s and then start the primary circuit.
after these modifications the problem just happens 1 in 10 times, but for watering planets automatically in case of 90 Km far away, it is necessary to work very precisely without any problem.
I do not have any scope meter or something, I cannot afford any solid state relay, please help and save the project. TNX.