Boncuk
New Member
Hi,
I am going to assist a member of this forum building a can crusher (Electronic projects Designs/Ideas/Reviews --> "Need help with auto starting a motor".
No matter if a can is crushed mechanically or pneumatically, the pressure on it has to be about 70lbs which is also sufficient to completely crush a hand.
To minimize the risk of injuries I want to make a receptacle fitted with a sliding door and driven by a small DC motor with reduction gear.
To activate the crusher an object has to be sensed and the door must be closed.
The door will slide open if an object is brought into sensing range, wait 1 to 2 seconds and then close. This again burries the risk of squeezing fingers in the door, which can be solved for by using an H-bridge IC with current sensing input(s), reversing the motor immediately if something goes wrong.
I have found a lot of H-bridges at ST and National, but not the right thing. They are either half bridges, dual bridges or high power (high voltage) bridges.
Maybe one of you knows a chip which will suit the requirements: single full H-bridge, motor supply voltage 12VDC, continuous motor current 1A, current sensing and several flag outputs (not desperately required) for malfunction tracking.
Remark: Half bridges require power MosFets at the outputs, which is not desireable because of the extra wiring and resulting board size.
Thanks
Hans
I am going to assist a member of this forum building a can crusher (Electronic projects Designs/Ideas/Reviews --> "Need help with auto starting a motor".
No matter if a can is crushed mechanically or pneumatically, the pressure on it has to be about 70lbs which is also sufficient to completely crush a hand.
To minimize the risk of injuries I want to make a receptacle fitted with a sliding door and driven by a small DC motor with reduction gear.
To activate the crusher an object has to be sensed and the door must be closed.
The door will slide open if an object is brought into sensing range, wait 1 to 2 seconds and then close. This again burries the risk of squeezing fingers in the door, which can be solved for by using an H-bridge IC with current sensing input(s), reversing the motor immediately if something goes wrong.
I have found a lot of H-bridges at ST and National, but not the right thing. They are either half bridges, dual bridges or high power (high voltage) bridges.
Maybe one of you knows a chip which will suit the requirements: single full H-bridge, motor supply voltage 12VDC, continuous motor current 1A, current sensing and several flag outputs (not desperately required) for malfunction tracking.
Remark: Half bridges require power MosFets at the outputs, which is not desireable because of the extra wiring and resulting board size.
Thanks
Hans