Chotu A Mini Robot Chassis


CHOTU is an innovative small robot, built for hobby purpose. It’s an open metal frame architecture which holds 2 geared DC motors driving a 72mm wheels It’s a two wheel design with a freewheeling front caster ball.. This kit includes all parts needed to assemble the chassis. This project is easy way to learn real-world engineering skills, its great option for first time robot-builders.

Dimensions:  Width 110mm X Length 155mm X Height 72mm,


  • Motor Speed 120 RPM Approx.
  • Wheel Diameter 72MM
  • Screws 4 NOs for Motor M3X25mm with Nuts
  • Snap Fit On/OFF Switch
  • Screws 4Nos 3MX 10mm for PCB Or Acrylic
  • Caster Diameter 29mm
  • Chassis has facility to Mount AAX4 Battery Holder ( Battery Holder Sold Separately)
  • Quarter Pin 3MMX45MM
  • Chassis Weight 125grms
  • Two Wheels Weight 40 Grms




4 Wheel Drive Power Full DIY Robot Aluminum Chassis

This is a  Power full robot for Hobby and professional use, Its   4 wheel drive,  4 numbers of 12V 120 RPM DC motors, Robot works with PS2 wireless remote, also can be use with Futaba RC Remote with longer range. Can be use as defense, subservience purpose , duct cleaning.

  • Aluminum 4WD Chassis
  • 6x AA Battery Holder
  • 4x 12V DC Gear Motors
  • 4x 100 mm Wheels
  • DC Motor Connect Cable
  • PS2 Wireless Remote
  • PS2 Receiver with inbuilt cables
  • Micro-Controller Based Motor driver








3Amps DC Motor Speed & Direction Controller Using LMD18201 & 555 Timer

The circuit shown here are a DC Motor Speed and Direction Controller. Driver can handle DC Motor Load Up to 3Amp and DC supply 12V to 48V DC, The board is based on LMD18200 which is H-Bridge driver & 555 Timer IC generate PWM signal for speed control. Slide provided for direction Control. PWM duty cycle 10% 95%.

The LMD18201 is a 3A H-Bridge designed for motion control applications. The device is built using a multi- Shorted Load Protection technology process which combines bipolar and Internal Charge Pump with External Bootstrap CMOS control circuitry with DMOS power devices on Capability the same monolithic structure. The H-Bridge configuration is ideal for driving DC and stepper motors. The LMD18201 accommodates peak output currents up to 6A.

  • Motor Supply 12V 48V DC
  • Motor Load 3Amp 12V 48V DC
  • Logic Supply 5V DC
  • SW1 : Slide Switch To Change the Motor Direction CW/CCW
  • Duty Cycle 10% To 95%
  • Frequency 5Khz Approx.
  • Potentiometer Speed Adjust
  • LED Power Indicator

Note : J1 Jumper Close For Normal Operation.


MPXM2010GS 0 To 10kPa (0 To 1.45 PSI) Pressure Sensor Module

The MPXM2010GS silicon piezoresistive pressure sensors provide accurate and linear voltage output directly proportional to applied pressure. These sensors house a single monolithic silicon die with strain gauge and thin film resistor network integrated. The sensor is laser trimmed for precise span, offset calibration and temperature compensation. The series includes a strain gauge and thin-film resistor network integrated on each chip



  • Temperature Compensated over 0 to +85 C
  • 0 To 10kPa (0 to 1.45psi)
  • Output 25mV Full Scale
  • Supply 10V DC (10-16V Possible)


  • Respiratory Diagnostics
  • Air Movement Control
  • Controllers
  • Pressure Switching

This Details is from NXP Application AN1950

The resolution of the system is determined by the mm of water represented by each A/D count. As calculated above the system has a span of 226 counts to represent water level up to and including 40cm. Therefore, the resolution is:

Resolution=mm of water/Total # counts=400mm/127 counts=3.1 mm per A/D count


Bellow Schematic from NXP Application Note

Window Comparator Circuits

Comparator based window comparator is tiny board, compare the coming voltage weather it is within a specific voltage window. You can set the upper and lower limits of the voltage by adjusting with onboard presets. Circuit works with 5V DC


Digitally Controlled Analog Microphone Preamplifier Using PGA2505

The project is based on PGA2505 which is a digitally controlled, analog microphone preamplifier designed for use as a front end for high performance audio analog to digital converters (ADC). The PGA features includes low noise, wide dynamic range, and a differential signal path. An on chip dc servo loop is employed to minimize dc offset, while a common mode servo function may be used to enhance common mode rejection. PGA2504 features a gain range of 9dB through 60dB (3dB/Step) , along with unity gain setting.