Noodles141
Member
Ok so some of you may remember me asking for some help on circuit diagrams and stuff and well i finally finished my project i was working on and its pretty awesome, keep in mind i am 1st year haha this may not blow the minds of the experienced. Was for my electronics course at University. The project description was given to us as a mobility aid for the blind. Our idea was to put them on sunglasses that a lot of blind people already wear. We went through a lot of ideas and scrapped alot but finally came up with this idea; two LDR's on the side that sensed extreme light perpendicular to the wearers line of "sight". Small motors were placed behind the ears to alert the user when the corresponding LDR sensed light. We did this part with a voltage divider for the LDR and a simple inverter switch. We also put one on the front to sense light direction in front of the users line of "sight". This was hooked up to a 555 setup as a oscillator with the LDR dictating the discharge time of the cap. We also cheated a bit and put our beeper in backwards so it beeps once then shorts or stops beeping or something. This works to our advantage as the front LDR kinda acts as park assist but for light. the more intense the light the fast it beeps. here are some pics:
View attachment 68181Just a pic of the whole thing. a bit bulky but is ment to be a prototype.
View attachment 68183picture of front LDR.
View attachment 68184Picture of one of the sides, LDR on the right and motor on the left(it vibrates to indicate if there is light on the LDR). there is a push to make button there but only on this side. the circuit is setup with a monostable 555 setup so when this button is pressed current is supplied for a set amount of time or aslong as the button is held. this is done to save power.
View attachment 68185our control box lol very last minute since we forgot to go buy one so we made one out of thin cardboard.
View attachment 68186the actual circuit board. yes very messy but we were pressed for time towards the end and we ran out of wire so we had to make some with shorter ones thats why there is so much heatshrink haha. all in all it worked perfectly and the group i was in was very happy and we all worked hard. First university group experience and it went without a fault. Dont think many people can say that.
Please comment, will post circuit diagram if you really want to see it.
View attachment 68181Just a pic of the whole thing. a bit bulky but is ment to be a prototype.
View attachment 68183picture of front LDR.
View attachment 68184Picture of one of the sides, LDR on the right and motor on the left(it vibrates to indicate if there is light on the LDR). there is a push to make button there but only on this side. the circuit is setup with a monostable 555 setup so when this button is pressed current is supplied for a set amount of time or aslong as the button is held. this is done to save power.
View attachment 68185our control box lol very last minute since we forgot to go buy one so we made one out of thin cardboard.
View attachment 68186the actual circuit board. yes very messy but we were pressed for time towards the end and we ran out of wire so we had to make some with shorter ones thats why there is so much heatshrink haha. all in all it worked perfectly and the group i was in was very happy and we all worked hard. First university group experience and it went without a fault. Dont think many people can say that.
Please comment, will post circuit diagram if you really want to see it.
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