This is a 1217-POLOLU Encoder for Pololu Wheel 42x19mm.
This quadrature encoder works with our micro metal gearmotors, 42×19mm wheel, and extended bracket to measure the rotation speed and direction of the wheel. With twelve teeth on the wheel, the system provides a resolution of 48 counts per revolution, which corresponds to a linear resolution of just under 3 mm or 1/8".
This quadrature encoder board is designed to work with Pololu micro metal gearmotors by holding two infrared reflectance sensors inside the hub of a Pololu 42×19mm wheel and measuring the movement of the twelve teeth along the wheel’s rim. The two sensors are spaced to provide waveforms approximately 90 degrees out of phase, allowing the direction of rotation to be determined and providing four counts per tooth for a resolution of 48 counts per wheel rotation. Each analog sensor signal is fed to a comparator with hysteresis to provide glitch-free digital outputs. The compact layout of the board fits all of the components within the envelope of the hub and tire, allowing the board to be mounted between the motor and a chassis. The encoder is calibrated for operation from 4.5 V to 5.5 V, but it can be recalibrated for operation at 3.3 V.
|
Part#
|
Product
|
Size
|
Weight (g)
|
Minimum operating voltage (V)
|
Maximum operating voltage (V)
|
Voltage (V)
|
Average input current (mA)
|
PCB dev codes
|
Other PCB markings
|
|---|---|---|---|---|---|---|---|---|---|
| 1523-POLOLU | Magnetic Encoder Pair Kit for Mini Plastic Gearmotors, 12 CPR, 2.7-18V | 20 mm × 16.5 mm1 | 2.42 | 2.7 | 18 | enc04a | 0J9719 | ||
| 3081-POLOLU | Magnetic Encoder Pair Kit for Micro Metal Gearmotors, 12 CPR, 2.7-18V (HPCB compatible) | 10.6 mm × 11.6 mm3 | 1.04 | 2.7 | 18 | enc03b | 0J8984 | ||
| 2599-POLOLU | Magnetic Encoder Disc for Micro Metal Gearmotors, 12 CPR (Bulk) | 7.65 mm diameter × 2 mm thick | 0.3 | ||||||
| 2591-POLOLU | Optical Encoder Pair Kit for Micro Metal Gearmotors, 3.3V | 9.6 mm × 11.6 mm | 0.75 | 3.3 | 24 | ||||
| 2590-POLOLU | Optical Encoder Pair Kit for Micro Metal Gearmotors, 5V | 9.6 mm × 11.6 mm | 0.75 | 5 | 12 | ||||
| 1218-POLOLU | Pololu 42×19mm Wheel and Encoder Set | ||||||||
| 1217-POLOLU | Encoder for Pololu Wheel 42x19mm |
Notes:
- 1. The assembled encoder will extend 4.25 mm beyond the back of the motor (it fits entirely within the length of the extended motor shaft).
- 2. Weight of full set. Each encoder board weighs ~0.6 g and each magnet disc weighs ~0.6 g.
- 3. The assembled encoder will extend 5 mm beyond the plastic motor end cap (it fits entirely within the length of the extended motor shaft).
- 4. Weight of full set. Each encoder board weighs ~0.2 g and each magnet disc weighs ~0.3 g.
- 5. Weight of full set. Each encoder board weighs ~0.2 g and each encoder wheel is less than 0.1 g.
WARNING
