Fusion Brain CarPC LT1 dash gauges project
Lots of good info on this site, but I'm not finding specifics on what people did, how it looked and how it worked. I'm sure a lot of you college kids will find this overly obvious, but it might help out one or two other people. More importantly somebody will pipe up "are you an idiot?" and prevent me from making a mistake.
This is a dash gauge display for my kit car. '87 Firebird chassis, '95 Trans Am drive train, K1 Evoluzione body. Don't worry about reliability, few believe this car will ever actually see the road. I have V4 Fusion Brain and the balance of my order should arrive any day with connectors and temp sensors. I'm running this on a Toshiba M200 touch screen laptop (I may never need dedicated carpc, see above). Been using Gimp to create png images for MDX. More on my car can be seen at http://www.cardomain.com/ride/2234824
First up, battery voltage: 0-18V battery range. I'll be connecting a 3K ohm 1/4watt resistor to a switched 12V power source. That will be connected to both a FB AIN and a 1K ohm 1/4watt resistor. The 1K ohm will be grounded to the car. I've read they should be kept under 1K. I thought bigger meant less current constantly flowing off the battery when I placed my order. Feel free to explain that.
Next, Fuel level: Original GM 0-90 ohm sensor. I'll connect a FB 5V out to a 51 ohm 1/4watt. The 51 ohm will be connected to the FB AIN then a 2.2 ohm and the signal wire from the fuel level sender. Should give me a 0.2V-3.2V reading.
Oil pressure: Original GM 0-90 ohm sensor. I'll connect a third FB 5V out to a 51 ohm 1/4 watt. The 51 ohm will be connected to the FB AIN, a 2.2 ohm and the single wire on the oil pressure sensor. Should give me a 0.2V-3.2V reading. Autometer 2246 3 wire 5V sender would be easier to get PSI values from, but they are $100. I'll try and figure out the math for the one wire.
Water temp: My plan is to drill out the existing water temp sensor and epoxy a 3 wire FB store temp sensor into the housing. Plug it into the FB.
Going to buy some more resistors...