HUD project with auto dimming backlight
Posted: Thu Apr 23, 2020 6:27 pm
Hello all,
I have an Android car radio and a bluetooth OBDII dongle. I have the app Torque installed on the radio and I can read lots of data of my car. Speed, Revs, Engine temp, Turbo pressure, Engine load, etc. Very cool, but I don't want to have to look to my radio all the time, to see certain data, like speed, revs and turbo pressure. So I came up with the following idea. Something similar as in this https://steemit.com/technology/@solidac ... 235457407z link, but with a few twists.
I need an Android device to run Torque, it won't work on windows, iOS er Linux, only on Android. So far, no problems, I can have an LCD display with a reflective glass on it and plug in an Android device wich runs Torque. But then I come across the following problem, the brightness of the LCD is good in (bright) daylight, but is way to bright when it is dark(er) outside or at night. So I need the LCD to automatically dim it's backlight when the daylight is getting lower or when it is night.
I thought about a Raspberry Pi with an HDMI input module, connect a light sensor to it and have an LCD controller attached to the RPi, so the video signal will be transferred to the LCD display. Is my thinking correct or is there a much better and cheaper option? All I want is the brightness of the LCD automatically adjusted according to the daylight brightness.
I have an Android car radio and a bluetooth OBDII dongle. I have the app Torque installed on the radio and I can read lots of data of my car. Speed, Revs, Engine temp, Turbo pressure, Engine load, etc. Very cool, but I don't want to have to look to my radio all the time, to see certain data, like speed, revs and turbo pressure. So I came up with the following idea. Something similar as in this https://steemit.com/technology/@solidac ... 235457407z link, but with a few twists.
I need an Android device to run Torque, it won't work on windows, iOS er Linux, only on Android. So far, no problems, I can have an LCD display with a reflective glass on it and plug in an Android device wich runs Torque. But then I come across the following problem, the brightness of the LCD is good in (bright) daylight, but is way to bright when it is dark(er) outside or at night. So I need the LCD to automatically dim it's backlight when the daylight is getting lower or when it is night.
I thought about a Raspberry Pi with an HDMI input module, connect a light sensor to it and have an LCD controller attached to the RPi, so the video signal will be transferred to the LCD display. Is my thinking correct or is there a much better and cheaper option? All I want is the brightness of the LCD automatically adjusted according to the daylight brightness.