So I am working with ESP32 which is powered by a battery, so I want it to wake up only when a contact sensor value changes. I have a simple code for esp32. I am using 2 gpio, pin numbers 33 and 13 on the board, each one with a contact sensor. So esp32 should go to deep sleep and wake up when any of these contact sensors change the value from 1 to 0 or from 0 to 1.
i have try to do it with rtc_io ext1 and im not sure i can do this with rtc_io ext1. But after researching i haven´t see any other method to interrupt the deep sleep mode using 2 GPIO. Any idea about how can i resolve this problem???
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I wanted to connect arduino mega with GSM shield(mounting) and a ultrasound sensor with a battery(9V) to post data and send SMS. but it was working for 10 minutes and stops working i.e the lights are on but the signal is not constant(checked with all the networks and signal strengths : no issues there). It is working properly with new battery for 10 minutes(tested with several new batteries)Is this power issue. If yes, please help me resolve this issue.
-Is GSM shield mounting creating the problem?
-how to get a long battery life with arduino and GSM shield.
Thanks,
Sandeep
This is power issue, GSM modem uses 1W (200mA at 5V) of power on 850/900 MHz, and 2W on 1800/1900 MHz, and GSM shield requires peaks of up to 2A current.
You need more batteries or dc power supply.
My circuit with Arduino Due works perfectly with USB, when I plug a 9V battery on Power Jack works for some seconds then Arduino just turn off.
I tried with 3 new batteries and VIN PIN as well, is my board defective?
please check AMS 1117 ic..
first remove all connection and give 9 volt in input of ic.
After check voltage on output pin.
if output voltage is not equle to 3.3V,change ic.
your controller will work properly
So, I'm building an Arduino toy car. It runs with 4 motors and has 2 color sensors and 8 IR sensors. It must work on battery because i don't want it to be hooked to USB all the time and motors require much more current than USB can provide. So here's the problem...
When I have my arduino powered with USB cable or USB cable and battery, it works perfectly, but when I have it powered only on battery (7.2V), 4 LED's in the left color sensor glow dimmer, and the right one doesn't even work.
I should point out that some of the pins of color sensor that should be plugged in 5V or GND are plugged in digital output pins set on HIGH or LOW.
The arduino i'm working on is Arduino Mega 2560 and color sensors are TCS230.
I think you should measure supply current of the board and then check if your battery is able to provide such value. Also try to feed the board from external supply through wall adapter connector (or Arduino's Vin terminal). The idea is that you may need higher voltage and(or) current, then 7,2V.
Check to make sure you have the correct resisters values in place to drive the LEDs. You can sometimes get away without doing so but it is iffy and you can sink a lot of current you don't really need to. I found this link, "Driving LEDs with an Arduino".
So, I got two boards, which both need turn up the light, how should I connect them? I can't use only one board.
If either board can turn the relay on, you can "OR" the two output pins with diodes into the relay. This would also mean that one Arduino cannot turn the relay OFF if the other one is still ON.
Of course, you should use something to drive the relay -- don't hook it directly to the Arduino:
And don't forget the reversed diode across the relay coil. It will supress the spike when you turn the relay off. You don't say what relay you're using, but I am assuming it's mechanical, not an SSR (solid state relay). You wouldn't need that diode if it's an SSR.
If you need either one to turn it ON or OFF (either Arduino can toggle the light), you will have to connect the relay to just Arduino 1. Then connect the Arduino 2 to Arduino 1 with a different pin. Then Arduino 2 can signal Arduino 1 to toggle the relay. Arduino 1 can toggle the relay without telling Arduino 2 anything.
I am using a four relay shield to power solenoids, however every time a solenoid is used the Arduino reboots immediately.
We have done this for two different projects with the same type of shield and both cause the same problem.
I am having some trouble figuring out what is causing the system reboot. Any ideas?
The shield is the Catalex relay Shield.
It sounds like driving a relay coil is causing the voltage to drop. After the voltage recovers, the Arduino reboots like it was just turned on.
What happens when you disconnect the solenoids? Does the same behavior happen? These are relays, so the circuit on the relay side should be isolated.
Are you powering the Arduino from a power supply, or the USB port?
Oddly, if you look up the data sheet for the HLS8L-DC5V-S-C:
http://www.dipmicro.com/?datasheet=HLS8L.pdf
it says a 5V relay (L type) should have a coil resistance of 70 Ohms , for 0.35 W, so you should need 70 mA to drive it; I think there is a small transistor that drives that from the pins, but you still need the 70 mA from somewhere to close each relay.
Which version of the board do you have?
http://seeedstudio.com/wiki/Relay_Shield
My search on the Catalex Relay Shield pointed to the Seeedstudio version, but it could be that your board needs to be externally powered.