Hello everyone
i'm trying to make a simple timelapse project with an arduino and an old camera for a friend
he gave me this old digital camera that works with 2x AA batteries (it has also a DC jack input)
i already opened it and soldered wires to the appropriate buttons, 2 for ON and OFF and 2 for focus and shoot
i put the batteries and tried my wires and they work
Then i cut one of my old old 5v cell phone power supply, wired to a dc converter ( https://www.aliexpress.com/item/XL6009-Boost-Converter-Step-Up-Adjustable-15W-5-32V-to-5-50V-DC-DC-Power-Supply/32808527751.html ) and connected to 2 different dc jack that i have laying around but nothing, i got only 2 little leds from camera to turn on and off repeting but the camera itself wont turn on
so i put back the 2 battery and worked
so i soldered 2 wires at the 2 poles at the camera but i got the same thing happening with the dc jack
what am i doing wrong? What do i need to add to the circuit?
ps. next to the dc jack input it says 3.4V DC (But because my batteries were 1.3V and the camera worked, i tried from 3.5V to 2.6V but nothin worked again
Does the DC input jack say what polarity to use? Sometimes the center pin is negative and the outer shell is positive.
It could be (maybe SHOULD be) that the camera has a reverse-polarity protection diode between the DC jack and the rest of the camera. That would explain why the DC in jack has a slightly higher voltage than the batteries: to account for the voltage drop across the protection diode.
If you see LEDs go on then you are on the right way. If the LEDs go off again, and all that in a cycle, I'd guess that the camera boots repeatedly and fails at some step for some reason. The reason may be a too low voltage (brown out interrupt), caused by too little current from your power supply, or eventually too much ripple from rectified but not stabilized AC. I'd check the supply voltage with a scope.
johnwasser:
Does the DC input jack say what polarity to use? Sometimes the center pin is negative and the outer shell is positive.
It could be (maybe SHOULD be) that the camera has a reverse-polarity protection diode between the DC jack and the rest of the camera. That would explain why the DC in jack has a slightly higher voltage than the batteries: to account for the voltage drop across the protection diode.
The DC input jack i used is only the jack with the two wires, so i changed positive with negative
In both case it wont turn on
one doesnt do anything
one is like only flickering the leds
So for some reason i wanted to try another thing so i opened the camera again and i soldered 2 wires directly in the terminal used from battery and tried again but happened the same thing
DrDiettrich:
If you see LEDs go on then you are on the right way. If the LEDs go off again, and all that in a cycle, I'd guess that the camera boots repeatedly and fails at some step for some reason. The reason may be a too low voltage (brown out interrupt), caused by too little current from your power supply, or eventually too much ripple from rectified but not stabilized AC. I'd check the supply voltage with a scope.
If i'm being honest i really didnt thought of current was too little
searching the web i found that the power supply from the Olympus is rated this:
"e-7au ac adapter output: dc 3.4 volt 2.5 amp (input is ac120v 50/60hz 0.2amp)"
I used a 5v 1A power supply with a dc converter to 3.4 at first, then tried from 3.6 to 2.6
I guess i should try with a more "powerful" powersupply like 3 ampere at least?
I need to search if i have it i really dont know and buying the right adapter is for sure not an option (around 15-20$)
johnnykol:
the power supply from the Olympus is rated this:
"e-7au ac adapter output: dc 3.4 volt 2.5 amp (input is ac120v 50/60hz 0.2amp)"
I used a 5v 1A power supply with a dc converter to 3.4 at first
3.4V at 2.5A is 8.5 Watts. 5V at 1A is 5W and you will lose some of that in the conversion. You should probably use a 9W or 10W supply: 5V 1.8A or 5V 2A.
NOTE: The boost/buck converter you bought says that its output range is "5V ~ 35V". I don't know what problems it will cause when you try to use an output of 3.4V. It may have excessive ripple and/or poor efficiency. Perhaps a different DC/DC converter would be a good idea.
johnwasser:
3.4V at 2.5A is 8.5 Watts. 5V at 1A is 5W and you will lose some of that in the conversion. You should probably use a 9W or 10W supply: 5V 1.8A or 5V 2A.
NOTE: The boost/buck converter you bought says that its output range is "5V ~ 35V". I don't know what problems it will cause when you try to use an output of 3.4V. It may have excessive ripple and/or poor efficiency. Perhaps a different DC/DC converter would be a good idea.
I bought it months and months ago and really didnt look at description, only read the title a few days ago and i didnt notice it couldn/shouldnt go lower than 5V
guess maybe this with not enough power is my problem
i'll try find something better thank you both of you!!