Description

<style>.e_editor{font:14px/24px Arial,'microsoft yahei','Times New Roman','b8bf53';}.e_editor div,e_editor p,e_editor td,e_editor th,e_editor li{font-weight:inherit;font-size:inherit;font-style:inherit;font-family:inherit;}.e_editor ul{margin:-10px 0 20px;}.e_editor li{padding:5px 0;}.e_table{width:96%;border-collapse:collapse;empty-cells:show;}.e_table th,.e_table td{padding:5px;border:2px solid #eee;}.e_img{padding:10px 0;text-align:center;}.e_p{line-height:20px;padding:0 0 20px;text-indent:0em;}</style> <div class="e_editor"> <div class="e_img" style="text-align:left;"> <span style="font-family:inherit;font-size:inherit;font-style:inherit;font-weight:inherit;text-indent:0em;">We are not the first to make an Motor Shield for Arduino. But could be that we are the first that make a Motor Shield with a minimum of flexibility.</span> </div> <div class="e_p"> We are studing a WiFi robot with camera controlled by Arduino. The robot will be controlled by browser. But we find a problem with an existing shield: the pin SPI to controll Ethernet shield (that become WiFi shield) are the same of motor shield. </div> <div class="e_p"> So we reengineered the Motor Shield and we allow to user the choice of what pin use to drive the L298. Infact we provided some jumper to select the pin to use. </div> <div class="e_p"> <strong>The Motor Shield schematics</strong> </div> <div class="e_p"> The main power can be selected by a jumper: if the motors work at 12V and the current is less than 1A you can chose the VIN input (INT) and power the Arduino with a 12V, else if the motors work higher than 12V you must chose the EXT input anche connect the power to PWR screw. </div> <div class="e_p"> The core of the project is a L298 H-Bridge, a motor driver with this caracteristics: </div> <div class="e_p"> We chose the SMD version of L298 because is also simple to solder, but the profile is lower than the traditional version, so other shield could be mounted without problem. </div> <div class="e_p"> The main power is transferred to the analog input A5 through a voltage divider (R9 and R10) to reduce the voltage on A5. This can be useful e.g. for all the application that use a battery (like our WiFi robot). </div> <div class="e_p"> With the jumper DIRA and DIRB the user select the direction of the motor A and B. </div> <div class="e_p"> The speed is controlled by PWMA and PWMB. All the pins conneted to these jumpers are obviously PWM pins. </div> <div class="e_p"> The LD1 and LD2 are special leds that light on red or green in function of directions. </div> <div class="e_p"> With this shield the user can also drive a step motor without problem. </div> <div class="e_p"> <strong>Part list</strong> </div> <div class="e_p"> [code] </div> <div class="e_p"> R1: 4,7 kohm </div> <div class="e_p"> R2: 10 kohm </div> <div class="e_p"> R3: 4,7 kohm </div> <div class="e_p"> R4: 4,7 kohm </div> <div class="e_p"> R5: 10 kohm </div> <div class="e_p"> R6: 4,7 kohm </div> <div class="e_p"> R7: 1 kohm </div> <div class="e_p"> R8: 1 kohm </div> <div class="e_p"> R9: 100 kohm </div> <div class="e_p"> R10: 10 kohm </div> <div class="e_p"> C1: 100 nF 100 </div> <div class="e_p"> C2: 100 µF 63 VL </div> <div class="e_p"> C3: 22 µF 35 VL </div> <div class="e_p"> U1: L298P </div> <div class="e_p"> LD1: Led 5 mm R/G (L-57EGW) </div> <div class="e_p"> LD2: Led 5 mm R/G (L-57EGW) </div> <div class="e_p"> D1: 1N5819 </div> <div class="e_p"> D2: 1N5819 </div> <div class="e_p"> D3: 1N5819 </div> <div class="e_p"> D4: 1N5819 </div> <div class="e_p"> D5: 1N5819 </div> <div class="e_p"> D6: 1N5819 </div> <div class="e_p"> D7: 1N5819 </div> <div class="e_p"> D8: 1N5819 </div> <div class="e_p"> T1: BC547 </div> <div class="e_p"> T2: BC547 </div> <div class="e_p"> screw 2 via (3 pz.) </div> <div class="e_p"> Strip male 3 via (9 pz.) </div> <div class="e_p"> Jumper (5 pz.) </div> <div class="e_p"> Strip M/F 6 via (2 pz.) </div> <div class="e_p"> Strip M/F 8 via (2 pz.) </div> <div class="e_p"> PCB </div> <div class="e_img"> <br /> </div> <div class="e_p"> <strong></strong> </div> </div>