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More from wingedneko
being part of the secret easter bunny activity means to (mainly) build a easter present for some person who don't have a clue from whom it will come until the person opens up the present.
This year my presentee was
Kitsune_Nyx from Austria.
After a short while of thinking I decided to build a PCB-Badge (Printed Circuit Board) with standard-measuring (7 to 10cm ) and with a little "special", so its nearly 1cm in thickness.
The whole badge contains of PCBs, also the back and the walls, which I silver-plated and then soldered to the given form. On the topside of the badge I drilled two holes and secured them thru solder-rounds to add a lanyard.
I designed her Nickname as the well-known conductive paths on PCBs and included a few "real" ones which build up a sensor circuit to measure the surrounding brightness and switches on the green backlight (4x 14.000mCd LED) if the brightness sink below an adjustable mark (thru pot R11).
To suppress a fast on-off switching backlight in the not sharply defined twilight-zone I designed a schmitt-trigger (T4/T5) circuit in front of the low-side switch (T3), which controls the LEDs. So a hysteresis about 10% in each direction of the change of the brightness is given (which means it must be at least 110% brighter to switch the light off, as it must be to switch the light on).
As a second function Nyx can switch on the backlight whenever she wants, not depending on the brightness. A three-state switch (S1) controls the functional behaviour of the circuit.
As energysource I decided to use a 3.7V 1.0Ah LiPo battery-pack, which will last around 10h of continues use.
I added a little security-circuit beneath the battery pack to control the maximum of charging current and voltage (also undervoltage and reverse polarity which hopefully will never been set to the pack). It can't be seen, 'cause its directly mounted inner the badge on the LiPo.
Charging can be done thru a mini-USB-B Port and a standard USB-Port on the PC / Charging Wallsocket Powersupply or so on, e.g. iPhone Charger.
Feel free to ask further questions ;)
Info: All parts are packaged in 0402 / 0603 / SOT-23 aside the LiPo-secure-board which is build up in BGA and 0402.
This year my presentee was
Kitsune_Nyx from Austria.After a short while of thinking I decided to build a PCB-Badge (Printed Circuit Board) with standard-measuring (7 to 10cm ) and with a little "special", so its nearly 1cm in thickness.
The whole badge contains of PCBs, also the back and the walls, which I silver-plated and then soldered to the given form. On the topside of the badge I drilled two holes and secured them thru solder-rounds to add a lanyard.
I designed her Nickname as the well-known conductive paths on PCBs and included a few "real" ones which build up a sensor circuit to measure the surrounding brightness and switches on the green backlight (4x 14.000mCd LED) if the brightness sink below an adjustable mark (thru pot R11).
To suppress a fast on-off switching backlight in the not sharply defined twilight-zone I designed a schmitt-trigger (T4/T5) circuit in front of the low-side switch (T3), which controls the LEDs. So a hysteresis about 10% in each direction of the change of the brightness is given (which means it must be at least 110% brighter to switch the light off, as it must be to switch the light on).
As a second function Nyx can switch on the backlight whenever she wants, not depending on the brightness. A three-state switch (S1) controls the functional behaviour of the circuit.
As energysource I decided to use a 3.7V 1.0Ah LiPo battery-pack, which will last around 10h of continues use.
I added a little security-circuit beneath the battery pack to control the maximum of charging current and voltage (also undervoltage and reverse polarity which hopefully will never been set to the pack). It can't be seen, 'cause its directly mounted inner the badge on the LiPo.
Charging can be done thru a mini-USB-B Port and a standard USB-Port on the PC / Charging Wallsocket Powersupply or so on, e.g. iPhone Charger.
Feel free to ask further questions ;)
Info: All parts are packaged in 0402 / 0603 / SOT-23 aside the LiPo-secure-board which is build up in BGA and 0402.
Category Photography / Tutorials
Species Exotic (Other)
Size 1280 x 479px
File Size 126.5 kB
Comments