Schematic and BOM

A project log for Classic car intermittent wiper motor controller

Reversible, no extra switch, multiple frequencies delay module for classic British cars.

Frederic LFrederic L 10/31/2020 at 09:150 Comments


Here is the schematic of the controller highlighting the three main parts : regulator, microcontroller and relay.

Bill of Materials

                 Part numberManufacturerDescriptionQ
U1ATTINY85-20SUMicrochip8-bit Microcontrollers - MCU AVR 8K FLSH 512B EE 512B SRAM ADC 5V1
IC1LM2931DT-5.0GON SemiconductorLDO Voltage Regulators 5V 100mA w/Load Dump1
RL1V23076A1001C133TE ConnectivityAutomotive Relays Power Relay K1
T1BC846BLT1GON SemiconductorBipolar Transistors - BJT 100mA 80V NPN1
OK1SFH6186-3TVishayTransistor Output Optocouplers Phototransistor Out Single CTR 100-200>#/td###1
FB1, FB2FBMJ2125HS420-TTaiyo YudenFerrite Beads HI CUR CHIP BD 0805 42OHMS 25>#/td###2
D1, D2CGRTS4007-HFComchip TechnologyRectifiers SMD 1000V 1A2
D3SZMMSZ33ET1GON SemiconductorZener Diodes REG 0.5W 33V SPCL1
C1C0603C473K3RACTUKEMETMultilayer Ceramic Capacitors MLCC - SMD/SMT 25V 0.047uF 0603 X7R 10>#/td###1
C2CGA4J1X7S1E106K125ACTDKMultilayer Ceramic Capacitors MLCC - SMD/SMT 0805 25VDC 10uF 10% AEC-Q2001
C3GRM21BC71C106KE11LMurataMultilayer Ceramic Capacitors MLCC - SMD/SMT 0805 10uF 16volts X7S 10>#/td###1
C435ZLH100MEFC6.3X11RubyconAluminium Electrolytic Capacitors - Radial Leaded LOW IMPEDANCE ELECTROLYTIC CAPACITORS1
C5, C6C0603C104K3RAC3190KEMETMultilayer Ceramic Capacitors MLCC - SMD/SMT 25V 0.1uF X7R 06032
R1CRGP2512F470RTE ConnectivityThick Film Resistors - SMD CRGP 2512 470R 1% SMD Resistor1
R2, R3ERJ-3EKF1002VPanasonicThick Film Resistors - SMD 0603 10Kohms 1% AEC-Q2002
R4ERJ-3EKF1001VPanasonicThick Film Resistors - SMD 0603 1Kohms 1% AEC-Q200 1
J1-J47799Keystone ElectronicsTerminals M4 Screw term- H.D.4
J510129381-906004BLFFCI / AmphenolHeaders & Wire Housings ECONOSTIK HEADER DR VT TH 2X31