Rear Camera

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Vauxhall13
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Joined: Mon Jun 01, 2020 7:20 pm

Rear Camera

Post by Vauxhall13 » Wed Nov 11, 2020 12:45 pm

Hello there,

I’ve got a rear camera installed works fine no issues at all, only concern during night time if I put reverse I can’t see clear enough on the camera.
I’ve bought another camera that has a LED, I installed the camera but the LED lights constantly ON. Do you think if possible re wire the power of the camera through the Reverse light wire at least once Ive selected the reverse that’s the only time LED light ON? Is this will not cause any issues?

You advise is much appreciated and looking forward to all of you guys! Many thanks

astraowner
Posts: 1647
Joined: Sun Dec 02, 2018 8:54 am
Astra Model: 2016 Astra K 1.6 110HP
Astra Options: Lane assist, dual zone Climate Control.
Astra Colour: Asteroid Grey

Re: Rear Camera

Post by astraowner » Thu Nov 12, 2020 3:21 pm

I have a reverse camera on our Corsa D, it is connected to an eonon radio, and it is powered via the reverse light wire to make sure it is only powered when it is needed

Works fine.

IF you get flicker (Some cars use PWM for the bulbs) you can try and mount a electrolytic capacitor across the power wires of the camera, This will smooth out the power and make the camera stop flickering.

PWM = Pulse Width Modulation....Use pulsed DC, wider pulses = More energy, but when pulse is off there is 0 volts. The capacitor works as an energy reservoir that stores energy for the times the pulse is off.
2016 Astra K 110HP, Opel Eye camera, front and rear parking sensors, dual zone climate control and heated front seats, sight and light pack.

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astramaster
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Re: Rear Camera

Post by astramaster » Thu Nov 12, 2020 8:23 pm

astraowner wrote:
Thu Nov 12, 2020 3:21 pm
PWM = Pulse Width Modulation....Use pulsed DC, wider pulses = More energy, but when pulse is off there is 0 volts. The capacitor works as an energy reservoir that stores energy for the times the pulse is off.

What's the usual "time of power reserve" from those capacitors ?

astraowner
Posts: 1647
Joined: Sun Dec 02, 2018 8:54 am
Astra Model: 2016 Astra K 1.6 110HP
Astra Options: Lane assist, dual zone Climate Control.
Astra Colour: Asteroid Grey

Re: Rear Camera

Post by astraowner » Fri Nov 13, 2020 1:02 pm

astramaster wrote:
Thu Nov 12, 2020 8:23 pm
astraowner wrote:
Thu Nov 12, 2020 3:21 pm
PWM = Pulse Width Modulation....Use pulsed DC, wider pulses = More energy, but when pulse is off there is 0 volts. The capacitor works as an energy reservoir that stores energy for the times the pulse is off.

What's the usual "time of power reserve" from those capacitors ?
Well, that entirely depends on their capacity, and duty cycle of the PWM.

If they are low capacity they will run out of energy fast, but just sticking a massive capacitor on, will not work, if the pulses are very narrow and contain less energy than needed to charge the capacitor.

But the goal here is not to keep the DC super smooth, but to make sure that when the pulses go low, you dont go below or near the voltage threshold of the camera.

Imagine if you want light in a room, but someone is at the switch turning the power on and off. The light is super fast to go dark if the power is turned off, so if the duty cycle is 50/50 (For example ½ second on, ½ second off) you will not be able to see anything because your eyes will not be able to adjust fast enough for the light.

So if you stick a capacitor on that makes sure that the light only goes between 100% light and 80% light, your eyes will be able to adapt because the change is not that dramatic.

That is essentially what you are doing, making sure the camera is not seeing 12V, then 0V, then 12V etc etc.

If you can keep the power between 10V and 12 V, that's fine, because the camera can work with voltages between 9 - 15 volts.

But start off, just putting the camera across the reverse light, and see if it works, maybe there is smooting capacitors in the camera and maybe the car does not even do PWM for the reverse light.
2016 Astra K 110HP, Opel Eye camera, front and rear parking sensors, dual zone climate control and heated front seats, sight and light pack.

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astramaster
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Re: Rear Camera

Post by astramaster » Fri Nov 13, 2020 10:28 pm

astraowner wrote:
Fri Nov 13, 2020 1:02 pm
Well, that entirely depends on their capacity, and duty cycle of the PWM.

If they are low capacity they will run out of energy fast, but just sticking a massive capacitor on, will not work, if the pulses are very narrow and contain less energy than needed to charge the capacitor.

But the goal here is not to keep the DC super smooth, but to make sure that when the pulses go low, you dont go below or near the voltage threshold of the camera.

Imagine if you want light in a room, but someone is at the switch turning the power on and off. The light is super fast to go dark if the power is turned off, so if the duty cycle is 50/50 (For example ½ second on, ½ second off) you will not be able to see anything because your eyes will not be able to adjust fast enough for the light.

So if you stick a capacitor on that makes sure that the light only goes between 100% light and 80% light, your eyes will be able to adapt because the change is not that dramatic.

That is essentially what you are doing, making sure the camera is not seeing 12V, then 0V, then 12V etc etc.

If you can keep the power between 10V and 12 V, that's fine, because the camera can work with voltages between 9 - 15 volts.

But start off, just putting the camera across the reverse light, and see if it works, maybe there is smooting capacitors in the camera and maybe the car does not even do PWM for the reverse light.

Thanks for clarifying it. ;)
Where can I find a capacitor like that for 12V ?

astraowner
Posts: 1647
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Astra Model: 2016 Astra K 1.6 110HP
Astra Options: Lane assist, dual zone Climate Control.
Astra Colour: Asteroid Grey

Re: Rear Camera

Post by astraowner » Sat Nov 14, 2020 12:34 pm

astramaster wrote:
Fri Nov 13, 2020 10:28 pm

Thanks for clarifying it. ;)
Where can I find a capacitor like that for 12V ?
Any shop or online place that sells capacitors. Ebay is another posibility.

Look for electrolytic capacitors, the capacitance is measured it uF (MicroFarad)

Maybe 2200uF and the voltage just needs to be 16Volts or more.

Also remember that this is a polarity sensitive component, that needs to have "+" connected to positive and "-" connected to negative.

If connected incorrectly, you can expect a small "explosion" and a smelly sticky substance leaking.

Just an example from ebay here

https://www.ebay.co.uk/itm/2200uF-16V-E ... 2613619029
2016 Astra K 110HP, Opel Eye camera, front and rear parking sensors, dual zone climate control and heated front seats, sight and light pack.

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