On-board computer for a motorcycle with LCD from a mobile phone
Encyclopedia of radio electronics and electrical engineering /
Automobile. Electronic devices
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In this motorcycle trip computer project, you will see how you can use the LCD display from the Nokia 6280 mobile phone, controlled by the PIC18F4455 microcontroller. This BC is installed on a motorcycle Yamaha TDM850 (99 release).
Product Features:
- current gear display (1 to 5), plus neutral gear
- battery voltage. Display analog and digital
- time since launch
- analog and digital speedometer display
- daily counter
- display of the position of the throttle stick (in percent)
- analog and digital tachometer display
- if the engine is not running, the message "Engine Stop" is displayed
- display of air temperature, coolant, oil
- at certain speeds, the inscription "GearUp" (shift gear up) is displayed. In the settings mode (Debug Mode), it is possible to adjust the rpm at which a warning message appears
- in 5th gear, when the engine is spinning up more than 3500 rpm and when the TRP parameter is less than set in the settings (for example, 17%), the inscription "Economic Drive" (economical driving) is displayed
Settings mode (Debug Mode):
In this mode, the BC shows data from the speed sensor, TPS sensor (throttle stick), unique codes for temperature sensor devices
DS18B20. Also, in the settings mode, you can change the parameters for the "GearUp", "Economic Drive" modes and adjust the LCD backlight.
The device does not have any buttons for changing parameters, so the signals from the gear shift sensors and the throttle stick TPS sensor are used.
Entering the settings mode and changing parameters:
- move the shift knob to the lower gear and turn on the power. Debug Mode will appear on the device screen.
- move the gear selector knob down to scroll through the options.
- use the throttle to change the setting
- to save parameter changes, move the gear selector up. The parameter will change its color to blue.
All data is stored in non-volatile memory and is not erased after turning off the power of the on-board computer.
To exit the setting mode, turn the power off and then on again.
All electronic filling is located to the left of the protection and is connected to the LCD screen by a flat cable. On the second side of the BC electronic unit, connections to the ignition module, temperature sensors and the gear knob position sensor depart.
From the ignition module, the BC receives + 12V, rpm signals (RPM) and throttle.
Temperature sensors DS18B20 are connected via 1Wire protocol, in the "parasite power" mode (ie they do not require external power).
The gear selector sensors are located under the left crankcase guard. 2 optical sensors are used as sensors. In the photos you can see all 3 positions: normal position, downshift position and upshift position.
This motorcycle does not have a factory speed sensor, so I made it myself. As a speed sensor, I used a TLE4945 Hall sensor. The sensor is installed under the engine crankcase cover.
The Hall sensor requires magnets to work, in my case I used three magnets. The reason for this is higher accuracy: the speed is measured from 0 to 350 km/h with a resolution of 1 km/h, the data is updated every second. When mounting magnets, you must observe the orientation of their magnetic field. My magnet pole sequence is SNSNSN.
(click to enlarge)
The circuit diagram uses a simple solution to communicate PIC18F4550 and Nokia 6280 Lcd (320x240 pixels) via parallel port.
For DS18B20 temperature sensors, 1 1Wire I/O channel is used. 3 MK lines are used for the gear position sensor and neutral gear, one MK input is used for the speed sensor, 2 analog inputs for measuring the supply voltage and the throttle sensor, and one output is used for LCD backlight. The USB connector is used for programming and testing.
As mentioned above, all 3 DS18B20 sensors sit on the same 1Wire line and for the device to work properly, you need to know their unique 64-bit codes.
My sensors had the following codes:
"Air" = 9300000078625728
"Water" = D5000002061B2128
"Oil" = 4600000206125A28
For the correct operation of the BC, in the program code you must change these codes to the codes of your sensors (see the screenshot above).
Author: Koltykov A.V.; Publication: cxem.net
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