hello,
I have to design a low cost proximity sensor for an automatic sense and spray device. here is the link for a product similar to my task which is already in market
http://www.glade.com/en/products/sprays/sense-and-spray-automatic-freshener
http://tronixstuff.com/tag/glade/
1. As far, I have modulated the Ir emitter at 56khz using a pic mcu and used a tsop 4856 sensor in the reciever part. But i could acheive only a detection range of upto 4- 5 cms. the range is better(10 cms) when i use a 555 timer at the transmitter side. I dont know why.
how to acheive a range of 1 meter ( any low cost solution)??
2.I have also tried with high intensity Ir emitter ex: 700mw/sr, 180mw/sr to increase the detection range, but could not acheive it. shouzld i change any components while using these high intensity emitters??
3.I see that tsop sensor uses an active bpf and an amplifier to allow 56khz signals. And it allows only discrete signals modulated at 56 khz.
I want to create my own reciever circuit to allow only discrete on off signals modulated at 56 khz freq. how can i do that. what should i consider in building a circuit. I have attached a picture of a BPF that i tried in filter pro. but it doesnt seem to be correct when i tried to simulate it in TINA- TI.
Please let me know if this filter is suitable for 56 khz.
If not, what values should i change for my freq and why
4. In the second link that i have attached, is it a motion sensor that is used or a normal photodiode.
I am a newbie in this field. I have just started learning by doing. I dont want to give up yet, please help me out with my queries
Thanks and Regards
I have to design a low cost proximity sensor for an automatic sense and spray device. here is the link for a product similar to my task which is already in market
http://www.glade.com/en/products/sprays/sense-and-spray-automatic-freshener
http://tronixstuff.com/tag/glade/
1. As far, I have modulated the Ir emitter at 56khz using a pic mcu and used a tsop 4856 sensor in the reciever part. But i could acheive only a detection range of upto 4- 5 cms. the range is better(10 cms) when i use a 555 timer at the transmitter side. I dont know why.
how to acheive a range of 1 meter ( any low cost solution)??
2.I have also tried with high intensity Ir emitter ex: 700mw/sr, 180mw/sr to increase the detection range, but could not acheive it. shouzld i change any components while using these high intensity emitters??
3.I see that tsop sensor uses an active bpf and an amplifier to allow 56khz signals. And it allows only discrete signals modulated at 56 khz.
I want to create my own reciever circuit to allow only discrete on off signals modulated at 56 khz freq. how can i do that. what should i consider in building a circuit. I have attached a picture of a BPF that i tried in filter pro. but it doesnt seem to be correct when i tried to simulate it in TINA- TI.
Please let me know if this filter is suitable for 56 khz.
If not, what values should i change for my freq and why
4. In the second link that i have attached, is it a motion sensor that is used or a normal photodiode.
I am a newbie in this field. I have just started learning by doing. I dont want to give up yet, please help me out with my queries
Thanks and Regards
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