whitfijs-jw/volvo240-digitaldash

Volvo 240 Digital Dash Project. It's not much, but its honest work.

volvo240-digitaldash's Issues

Organize sensor inputs into single object

Move junk out of main.cpp

Pi Zero Support

Work on Pi Zero/Zero 2 support for a linux image along with the Pi3 and Pi4 images that are currently setup

Network not coming up on Rev B hardware

To boot can0 + mcp2515 in config.txt in boot partition had to be disabled.

Check if network interfaces needs to be tweaked as well to remove can0 bringup

Late 70's/Early 80's 240 dash connector support

Late 70's/Early 80's dash connectors are physically similar to the late 80's connectors for which this was designed to support. There should at least be some documentation on how a patch harness should be wired to work with the existing connections on the board.

As a part of this effort it's probably worthwhile to make an untested/unconfirmed section of the readme:

• VSS passthrough to the ECU on LH2.4/3.1 cars
• Anything to do with ABS/SRS on early 90's 2.4/3.1 cars
• Manual or automatic OD indicators (only tested with an M47)
• Probably a lot more

Eigen moved or deleted

Describe the bug
The folder declared for eigen pointer has either been moved or deleted, needed to manually download eigen package and put into that folder

Should be an easy fix

Long press mapping for user inputs -- trip odometer resetting

Long pressing a button should be configurable -- start with trip odometer resetting.

MAP sensor atmospheric offset not configurable

MAP sensor atmospheric offset is not configurable

Buildroot qt5 fails to build with gcc-11

gcc-11 and a I'm assuming 12 fail to build qt5. Immediate alternative is to use gcc-10 or below. Will need to look into the buildroot upstream to see how this is being handled.

ADC voltage calculation incorrect

In adc.h:

/* 5V inputs go through voltage divider for 3.3V ADC inputs -- not quite 100% */
static constexpr double REFERENCE_VOLTAGE_DIVIDER = (15.0e3 / (15.0e3 + 8.2e3));
static constexpr double INPUT_VOLTAGE_DIVIDER = (15.0e3 / (15.0e3 + 8.2e3));
static constexpr double VOLTAGE_CONVERSION_CORRECTION_FACTOR = 3.3 / (INPUT_VOLTAGE_DIVIDER * 5.0); 

farther down:

    /**
     * @brief Read scaled ADC value
     * @param channel: adc channel to read
     * @return current measured voltage
     */
    double readValue(int channel, double vRef = -1) {
        double volts = ((double)readRawValue(channel) / (double)mMaxVal);

        if (vRef < 0) {
            updateReference();
            return volts * mVref * VOLTAGE_CONVERSION_CORRECTION_FACTOR;
        } else {
            return volts * vRef;
        }
    }

Not sure what happened but the multiplication by mVref and division by 5.0 are superfluous and introduce a small error.

Input power protection is missing + 12V dash light input protection is suspect

Switched 12V from VSS connector to power supply is unprotected from reverse polarity and load dump.
Options:
- Big (5-7kW) unidirectional TVS diode to to cover both situations. Main goal is to limit load dump voltage spike to be within the voltage range of the power and other inputs. (https://www.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_sld8s_datasheet.pdf.pdf)
- Bidirectional TVS diode for load dump and schottky diode for reverse voltage protection.

12V input protection is a little more open ended.

Multiple screens + touch screen control (for smaller side screen)

Replace the cap-touch board with a 5" capacitive touch screen -- would only work with dual HDMI output rpi4.

todo:

• get EGLFS up and running on multiple screens (json?)
• create new layouts for accessory screen
• add support for side screen touch controller
• add touch controls to side screen for main display (left, right, reset trip, etc)
• (nice to have) possibly change accessory gauge style based on current main display style

Organize Warning light models into single object

Move the junk outside of the main file