Hello Dallas MakerSpace Electronics forum,
You know what happens when you do a good job: somebody asks you to do it again. You guys helped me solve the the PIR to 555 timer circuit at
Circuit Smoking, need help 211007
Circuit smoking, need help 211007 - Electronics - Dallas Makerspace Talk[Circuit Smoking Need Help 211007]
So here we go again:
Have developed a devise with a sail that runs up a kite string, drops a payload,
and releases the sail so the device (called a Messenger) can run back down
the kite tether and the process can be repeated with a new payload.
A Top Race Drone Clip Remote Control Object Launcher
https://www.amazon.com/Top-Race-Lau...hvlocphy=&hvtargid=pla-4584070138255163&psc=1
was adapted to the Messenger. It has been tested and works
reliably to about 150 yards.
There is some interest in the Messenger at several kite shops.
It would be good to develop the electronics in-house so
the radio transmitter/receiver would not have to be purchased
from Top Race. Also have a PCB shop and a 3D printing manufacturer
that could make the device custom designed for the Messenger.
A search was done. Almost all the DYI transmitter/receiver pairs
found used the Arduino microcontroller. Would like to avoid the space
and cost of the Arduino if possible. Found a radio transmitter/receiver
based on a 555 timer at
How To Make Simple RF Remote Control One Channel Transmitter and Receiver - YouTube
The transmitter/receiver pair was bought thru Amazon:
Based on a study of the YouTube two schematics were drafted:
Transmitter_w_555_schematic.gif
Receiver_w_IRFZ44_schematic_800_x_600.gif
The schematics are breadboarded but LED D1 is not reacting.
Not sure if the rules of the forum prevent more than one question per
post. If so, the questions will be separated into individual posts.
Question 1. Do the schematics make sense? Is there a defect
in the device found in the YouTube video and the schematics copied
herewith?
Question 2. Are there existing schematics for tested radio transmitter/receivers?
If there are, the a defect in the conversion of the device in the YouTube to
schematics drawn by me may might be avoided in lieu of a tested schematic.
Have looked on line with no luck.
Question 3. The 433 Mhz transmitter/receiver pair purchased
on Amazon has a place on the transmitter for an antenna.
There does not seem to be a place on the receiver for an antenna.
Would not the receiver need an antenna, not a transmitter?
Thanks.
Allen Pitts, Dallas TX
Troubleshooting Circuit Tests
Transmitter Tests
T1. 555: Pins 4 & 8: 12.3 volts
T2. 555: Pin 3 and R1.1: 5.0 volts
T3. R1.2: 2.7 volts
T4. 555: Pin 4: 12.3 volts
T5. 555: Pin 6 & R3.1: 5.6 volts
T6. 555: Pins 3.2: 5.4 volts
T7. R2.1: 5.4 volts
T8. R2.2: 12.3 volts
T9. 555: Pins 8: 12.3 volts
T10. Transmitter Vcc: 12.3 volts
T11. Transmitter Grnd: 12.3 volts
T12. Transmitter Data: 2.7 volts
Receiver Tests
R1. Q1 Gate: 5.1 volts
R2. Q1 Data: 0 volts
R3. Q1 Grnd: 5.1 volts
R4. R2.1: 1.9 volts
R5. R2.2: 5.1 volts
R6. LED anode: 0 volts
R7. LED cathode: .7 volts
R8. Receiver Vcc: .7 volts
R9. Receiver Data: 1.9 volts
R10. Receiver Vcc:: 5.1 volts