Introduction: Tiny Simple Running Robot_part_2

About: As a young kid, my curiosity in electronics was compelling.... why does thunder interrupt the radio reception? ....why does ROBOTs run without any wire?.... and I've been hooked on making thing ever since.


2.AAA batt.

3. homemade,

4.electronic toy,

5. DIY .

Step 1: Material


aluminum-foil roller * 1

foam * 1

dc-motor * 1

AAA battery * 3

AAA battery holder * 1

3 v Li battery * 1

3 v battery holder * 1

Cotton swabs * 1

IR rcvr (arduino module) * 1

any IR remoter(arduino module as well)* 1

RY1 : Solid State Relay * 1

D1 : IN 60 * 1

C1 : 100 uF * 1

R1 : 2.2 M OHM * 1

PCB * 1

breadboard * 1


cutter * 1

soldering iron * 1

hot glue gun * 1

Step 2: Schematic

Schematic 1 : part 1 of running robot.

Schematic 2 : part 2 of running robot


Schematic 3 : detail of control circuit.

RY1 : Solid State Relay ,
D1 : IN 60 ,

C1 : 100 uF ,

R1 : 2.2 M OHM .

IR receiver

IR remoter

Step 3: Cutout the Aluminum Foil Roller

use cutter to cut out a 10 cm small roller as the robot body.

Step 4: Prototype Control Circuit With Breadboard

the SPEC of SSR input is 3v. Vmin=3v

so I use an old Li battery. Vbatt <= 2.8v.

to be the bais voltage for the SSR.

TIPs : since the SSR is only support one way "ON" or "OFF",
and the single dc-motor is chewing lots of current !

therefor the better controlling circuit is based on arduino's

multiple way(s) in order to control the servo motor(s)

and programable..

Step 5: Soldering the Elements on the PCB

Maybe there are someone wondering

How does it work?
the IR remote emit the code out. ...and travel ....

and IR receiver get reception and output the waves.

the R1, C1, D1 construct a DET circuit.

therefor the waves after DET circuit become "HIGH" level.

Something like

Vin = 2.8 v + 0.5 v

Vin >= 3 v. Trigging the SSR

Therefor motor runs.

Step 6: ​Connect 2 Copper Wire From Motor to AAA Batt

connect 2 copper wire from motor to AAA battery holder.

and cut the red wire, and soldering to the SSR.

cut the foam into some slices.

fill the foam into the roller between battery.

fill the foam into the roller between SSR and PCB.

fill the foam into the roller between dc-motor.

left the IR RCVR at the roller edge.

Step 7: Make the Power-crowbar

use cutter to cutout the crowbar, just cut 80%.

do not cut the cotton head off ! and then connect to the dc motor's shaft.

Step 8: Finished

Cardboard Contest 2016

Participated in the
Cardboard Contest 2016