< Updated version here > This...
This only exist for reference
The EPM688-V2.0 is an Electro Permanent Magnet, combining the advantages of electro and permanent magnets. Ideal for cargo clamping on UAVs like quadrocopters. With virtually no power during steady state operation (<1mW) and 600mA for 0.3s during a switch cycle.
This product is no longer in stock
(Comes with one target square and 4x M3x0.5x5mm screws)
The EPM688-V2.X is an Electro Permanent Magnet, combining the advantages of electro and permanent magnets. This Device comes with integrated electronics that can be operated with 5V PWM signal common on RC electronics. The device is designed to hold 1kg of cargo. It is the user's responsibility to verify that this can be achieved in each particular case.
|Vcc max||Power supply Voltage max||7||V|
|Vcc min||Power supply Voltage min||3.3||V|
|Imax||Maximum Supply Current||600||mA|
|PWM on||Minimum signal high||1.75||ms|
|PWM off||Maximum signal high||1.25||ms|
|PWM error||PWM out of range||<0.75-2.25<||ms|
|Tmax||Maximum Temperature||80||deg C|
|Tmin||Minimum Temperature||-40||deg C|
|Tcharge||Charge time (1)||300||ms|
|Fmax||Max holding force||60||N|
(1) at 5V Vcc
OGCAN is an open hardware CAN bus interface that allows to control EPM and monitor its state via standard CAN bus or via serial CLI. OGCAN can be directly connected to EPM via two board-to-board connectors. Supported CAN protocols: CANaerospace, UAVCAN.
5V supply <100mV ripple
RC PWM signal input
The Data pin puts out the current state of the EPM, TTL high for On and TTL low for Off.
These pins are broken out to provide the user with the ability to reprogram the on board PIC12F. Further information can be found in the documentation provided by Microchip.
After connection VCC and GND the device will start charging the main capacitor. This takes around 300ms at 5V Vcc. After the charge is complete the EPM is ready to go in either the On or Off state. After a command has been issued there is a 300ms delay before the next switching command is accepted to ensure that the capacitor is charged. When operating at low voltages care must be taken to allow sufficient time for the charging to complete.
Pressing the Push button will toggle the EPM
A RC Pulse Width Modulated signal can also be used. High times between 0.75 and 1.25ms are consider an Off command. 1.75-2.25ms is considered On command. Moving the signal on time from neutral, 1.25-1.75ms to either On or Off range will command the EPM to go into the respected state.
The Led will blink once every 64 PWM signal errors. An error is either a missing or out time range PWM, about every 2 seconds for a missing PWM.
Led goes on when the button is pressed. The Led will blink rapidly 6 times after a command has been executed, either going On or Off.