Engine Temperature Display circuit for motorbike or car

3 Digit Engine or Engine oil Temperature monitor

For long way touring motorbikes, the engine or engine oil temperature monitor is a must have add-on. As temperature increases, biker can control the engine temperature by decreasing accelerator or stop for few hours, That may helps in engine seizure. So lets get started.

Circuit diagram

Components

• IC1:PIC16F684
• J1 connector to LM35
• R1 to R3: 1K ohm
• R4 to R10: 330 or 470 Ohm
• D1: 5V1 Zener diode.
• T1 to T3: BC547
• DIS1 to DIS3: Common cathode 7 Segment display.

Description

The PIC microcontroller's RA0/AN0 pin is set to analog input. LM35 temperature will gives 0.01V for 1'C so for 20'C=0.20V. this voltage is fed to the ADC of PIC, the 10-bit ADC output is converted into Celsius form and distribute them to 3 7 segment displays
ADC to integer form converson (10 bit): ((adc_i/P)*500)/1023;

PCB, Project files & HEX file

PCB

Simulation circuit

Project files

Download:yandex folder

I have tried my best to provide all the information, if you feel difficulty, Ask me for anything

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3 digit battery voltmeter (0 to 20VDC) for cars and motorbike

Easy and Simple Voltmeter Circuit

In every automobile info cluster, everyone needs to know about their battery status, some cars/motorbikes having that features but i don't think they all are showing in volts. some times we need to know about battery charging voltage for overcharging, over draining etc. it will helps user to troubleshoot their electrical systems as well.

Circuit:

The Above figure is circuit of voltmeter, I have used bus over there (blue color) to simplify the work.

• Note: Before connecting high voltage to the network, Make sure of configuration of input voltage divider network (ADC input pin connection) they are R12,R14,R14. After confirming voltage at the junction of R13 & R14 is < =5.1V, connect to microcontroller input.

Components: (some components in circuit diagram is not same as real parts)

• IC1:PIC16F684
• IC2: 7805 (I recommend Filtered voltage regulator circuit)
• R1,R2,R3: 1K Ohm.
• R5 to R11: 330Ohm or 470Ohm.
• D1:5V zener diode.
• T1,T2,T3: BC547
• DIS1,2,3: Common cathode 7 segment display.

Description:

This voltmeter can show voltage from 0.1V to 20.0V
The battery voltage is fed to the resistor voltage divider network to reduce voltage for 20V range to 5V range. That reduced voltage to the ADC of PIC microcontroller. the controller will convert ADC Hex value and show them in multiplexed 3 digit 7 segment display.

PCB,Project files and .HEX files

PCB

Simulation circuit

Project files:

Yandex Folder

Arduino sketch and circuits are coming soon...

I tried my best to simplify and provide all the information, If you feel problem in any ask me for solutions.

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LED Breathing circuit (PWM) for highpower LED, LED strip etc

LED breathing is one of the eye candy for every vehicles, LED fad in and fade out effect looks awesome with under body lighting.

We are using PIC microcontroller here, PIC12F683 is a small 8 pin circuit and having 1CCP module (PWM) in it, it wont cost too much, may be within Rs.60 (1$).we are using 1 pin for PWM output, 1 pin for button pressed feedback and another for button to vary breathing speed (delay between changing duty cycle of PWM), other 3 pins are left spare, you can use it for any other functions like blinkin.


Don't forget to get clean 5V DC power supply circuit before this

Circuit

*The components used in this circuit diagram of same package of original components,  

 Components

IC1:PIC12F683

R1: 1K Ohm

R2: 4.7K Ohm

R3: 100 Ohm

R4: 10K Ohm

R5: 470 Ohm

T1: BC547

Q1: TIP127

Push button, LED.

PCB, Project files & .HEX files

• Project files : Yandex Folder

Any problems?? Comment below

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12V to 5V Mobile Phone charger circuit (SMPS type)

The Voltage regulation Hero LM7805 will not works as we expected here, it will not provide enough juice(current) to charge cellphone's battery, especially more that 1500mah battery, So we need more current that provides enough juice to cellphone.

Here we are using LM2596 (Texas instruments) this provides 3A switch mode power supply. That is more than enough to charge 2 cellphones, Don't worry if you charge 1 cellphone, phone takes only max of 1A. It is the best/fast charging circuit i ever experimented.

Then here we go

Schematic

Components:

• IC1:LM2596
• D1: 1N5824 (schotty)
• L1: 33uH (coil & core type).
• C1:680uf 25V
• C2: 220uF 16V (different in schematic)
• R1,R2:100K
• R3: 470 Ohm.
• LED
• USB connector*

Project files and PCB:

Eagle Project file: DOWNLOAD

Reference: http://www.ti.com/lit/ds/symlink/lm2596.pdf
Any problems comment below or ping in Spot.IM community>>

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12V to 5V Clean Filtered DC power supply for automobiles

This circuit is to provide power supply for 1A 5V digital gadgets like gadgets including LCD, Microcontroller, or any gadgets or components that need neat and filtered 5V.

The microconroller based project for automobiles mainly having problems with power supply line, the car, motorbike or any automobile power supply includes starter motors, Horns, relays and so many voltage surging elements, the motors and relays may cause high backward spikes that may cause reverse polarity in line for few micro seconds. in other hand horn and again starting motor may cause sudden null voltage effects. But microcontroller needs pure uninterrupted power supplay.

The LM7805 is the hero of low cost voltage regulator as you are always use, But only 7805 didnt work for Automobile electronics it needs filter of-course. So here we are.

Circuit Schematic

Components:

• FB:ferrite bead - Normal (see picture).

  

  Ferrite Bead

• D1:1N4007.
• D2: MUR802 (super fast rectifier) (change in schematic).
• L1: 100mH 1.5W or 2W.
• C1,C2: 1000uF 25V.
• C3,C4: 0.1uF (Tantalum).
• IC1: LM7805 (change in schematic but same package in PCB).

PCB layout and project file:

• Eagle project file : Download

Any Problems, Comment below or ping in spot.IM community >>

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Programmed LED strip strobe circuit (Multi type with 2 channels)

Mainly designed for police like light switching. This circuit works best with LED strips, High power LEDes, and also Applicable for Indicators.
Well Programmed, 3 Switchable patterns, 1 pattern includes 3 set of blink types
This circuit is made by PIC microcontroller, here I pre-programmed for 3 sets of 3 type functions, You can edit that program…
The given PCB is designed with SMD packages,The project also including schematic with normal components make PCB yourself.

This circuit is formally “MMD Blinker”, made by / made for “Mozambi Moto Digital”

Schematic:

Components:

• IC1: PIC12F675 (wrong in schematic, same package and pin-out)
• IC2:LM7805 (wrong in schematic, same package and pin-out)
• Resistors: 10K, 1K, 4.7K, 100 Ohm.
• Capacitors: 0.1uF (tantalum recommended) .
• Diodes:
• D2:1N4007
• D1: 5V1 Zener diode.
• Q3,Q4: BC547
• Q1,2: PNP high power any.

PCB layouts, Project files(Eagle & MikroC) and .HEX code

• MikroC file: Download 
• Eagle File: Download 
• Programeed .HEX file: Download
• SMD-PCB
  

If any problems. comment below

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Modified 2 stage blinker circuit for LEDes and brakelight

This circuit is like an advanced version of first blinker circuit, it uses 2 astable circuits, not 2 IC. We can use 556 here. 2 Astable multivariator of Low and High frequencies are cascaded and gives good programmed pulse like 1 long pulse and 2 to 5 sort pulse (Depends upon setting).

The below circuit shows Multi-function blinker circuit

Components:

IC: U1A,U1B : LM556 (Duel timer IC)
Resistors: R1: 1.2K, R2:1K*, R3 750 Ohm, R5:220 Ohm
Pot: R4:1K Ohm, (R2:2K*)
Diode: D1,D2,D3: 1N4007.
Transistor: Q1: MJE200 or any power NPN transistor.
Capacitors: C1:100uF, C2,C4:10nF, C3:22uF.

Description:

• The First stage multivibrator is set to 5 hz, 50% duty cycle (on off 5 times in second ;) ).
• The second stage is a variable one. it varies from 15hz to 160hz
• When first stage in OFF state the second stage is ON -> High only
• When first stage is ON, The trigger circuit will activate second stage and low frequency pulses

Output graph:

PCB Layout & Project files:

• Multisim
• Cadsoft Eagle

If any problems, Comment below

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Simple 12V blinker (strobe) For Horns,Brakelight etc

Its a simple 555 Astable multi-vibrator circuit, for blinking 12V DC.

• It can be connected for brake light, blinking brake-lights draws more attentions than normal ones.
• Can be connected for horns for stroked sound (relay is needed).
• Can be used with LED strips.

Below schematic shows circuit of blinker.

Components:

1. U1: LM555
2. Resistors: R1:100 Ohm, R3:220 Ohm
3. Variable resistor (Potentiometer)R2 2K ohm
4. Capacitors: C1: 22uF(electrolytic),C2: 10nF (Ceramic or tantalum).
5. Transistor Q1 MJE200G or any NPN power Transistor
6. Diodes: D1: 1N4007, D2: 1N4745 (16V zener) -1 
7. Relay*.

* Ground may be body or battery -ve terminal.
*No need of 10K resister at output.

Connection for brake light:

PCB layout & Project files:

 

Project:

• Multisim Project: Downlaod

• Eagle cad PCB project : Download

If You have any problems, Comment below.

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