1LikesExample of connecting latest R8EF for a noob, please?
12-28-2020 | 02:16 PM
#1
Thread Starter
Tech Rookie
Joined: Dec 2020
Posts: 2
Example of connecting latest R8EF for a noob, please?
I looked and searched and came up with nothing and the answer may be trivially simple. I mostly used pre-built RC systems, so I am not up to speed with latest tech and setting up my own systems, please forgive my ignorance.
I got Radiolink T8S transmitter with R8EF receiver. What I can't figure out is where the heck do I provide power to R8EF receiver? I dealt with receivers that usually have VCC/GND and a bunch of outputs to plug in servos. This one seem to have a lot of options, and I have no idea even what option I need. I would like to build a simple ground RC car/bot. I'd like to use a few servos and motor PWM control.
1. This receiver has a bunch of channel outputs that I could probably plug servos into, that receiver seems like a small package to control anything but micro servos. I have some regular 5v/3A digital servos that I'd like to use. Is that thing can handle it, do I need another board, which one?
2. If I'd like a few channels for motor PWM speed control, is there ways to plug these receivers into PWM boards. It seems like it would be a common task for anyone using these radios for land vehicles.
3. How do I power this receiver, it does not have any pins labeled for power?
4. I always thought that ground and air vehicles required different RC transmitters and using air ones for ground vehicles was not either not legal or bad practice. It's been a while since I built my last project, is that still true? The company selling these radios advertised them for land/sea/air use.
many thanks in advance for any help here!
I got Radiolink T8S transmitter with R8EF receiver. What I can't figure out is where the heck do I provide power to R8EF receiver? I dealt with receivers that usually have VCC/GND and a bunch of outputs to plug in servos. This one seem to have a lot of options, and I have no idea even what option I need. I would like to build a simple ground RC car/bot. I'd like to use a few servos and motor PWM control.
1. This receiver has a bunch of channel outputs that I could probably plug servos into, that receiver seems like a small package to control anything but micro servos. I have some regular 5v/3A digital servos that I'd like to use. Is that thing can handle it, do I need another board, which one?
2. If I'd like a few channels for motor PWM speed control, is there ways to plug these receivers into PWM boards. It seems like it would be a common task for anyone using these radios for land vehicles.
3. How do I power this receiver, it does not have any pins labeled for power?
4. I always thought that ground and air vehicles required different RC transmitters and using air ones for ground vehicles was not either not legal or bad practice. It's been a while since I built my last project, is that still true? The company selling these radios advertised them for land/sea/air use.
many thanks in advance for any help here!
12-29-2020 | 08:34 AM
#2
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1. How many servos in total will you be using? The ability for the servos to run with enough force will largely depend on how they are being powered. For electric RC car applications, power is generally provided from the Electronic Speed Controller (ESC) through the Battery Eliminator Circuit (BEC). The current available in this BEC will determine how your servos run together. It is possible to buy an external BEC which allows for more current and connector directly to the battery, but then it is necessary to disconnect the power wire from the ESC's receiver plug so you aren't feeding in too much voltage.
2. All the numbered channels on the receiver will output a PWM signal. Typically for electric cars we power motors with electronic speed controllers, I'm not familiar with the PWM boards you mention, perhaps this is a robotics thing? How many motors or servos in total are you working with?
3. I believe you can provide power to any of the sets of pins on the receiver, so if you do use an ESC this will provide power to the receiver and the rest of the channels. If you aren't using an ESC, you can connect a battery to one of the pin sets instead.
4. Not sure about legality, but usually there are design difference between air/surface radios. As you mention, the Radiolink receivers are advertised for ground and air, with a shorter range listed for ground use (500m). Usually aircraft need more channels and compact, lighter receivers. This leads to the in-line receiver design like your R8EF. The T8S looks to be designed primarily for drone racing, but if you need all the channels and the layout suits you then I don't know any reason not to use it.
2. All the numbered channels on the receiver will output a PWM signal. Typically for electric cars we power motors with electronic speed controllers, I'm not familiar with the PWM boards you mention, perhaps this is a robotics thing? How many motors or servos in total are you working with?
3. I believe you can provide power to any of the sets of pins on the receiver, so if you do use an ESC this will provide power to the receiver and the rest of the channels. If you aren't using an ESC, you can connect a battery to one of the pin sets instead.
4. Not sure about legality, but usually there are design difference between air/surface radios. As you mention, the Radiolink receivers are advertised for ground and air, with a shorter range listed for ground use (500m). Usually aircraft need more channels and compact, lighter receivers. This leads to the in-line receiver design like your R8EF. The T8S looks to be designed primarily for drone racing, but if you need all the channels and the layout suits you then I don't know any reason not to use it.
12-30-2020 | 10:59 AM
#3
Thread Starter
Tech Rookie
Joined: Dec 2020
Posts: 2
1. How many servos in total will you be using? The ability for the servos to run with enough force will largely depend on how they are being powered. For electric RC car applications, power is generally provided from the Electronic Speed Controller (ESC) through the Battery Eliminator Circuit (BEC). The current available in this BEC will determine how your servos run together. It is possible to buy an external BEC which allows for more current and connector directly to the battery, but then it is necessary to disconnect the power wire from the ESC's receiver plug so you aren't feeding in too much voltage.
2. All the numbered channels on the receiver will output a PWM signal. Typically for electric cars we power motors with electronic speed controllers, I'm not familiar with the PWM boards you mention, perhaps this is a robotics thing? How many motors or servos in total are you working with?
3. I believe you can provide power to any of the sets of pins on the receiver, so if you do use an ESC this will provide power to the receiver and the rest of the channels. If you aren't using an ESC, you can connect a battery to one of the pin sets instead.
4. Not sure about legality, but usually there are design difference between air/surface radios. As you mention, the Radiolink receivers are advertised for ground and air, with a shorter range listed for ground use (500m). Usually aircraft need more channels and compact, lighter receivers. This leads to the in-line receiver design like your R8EF. The T8S looks to be designed primarily for drone racing, but if you need all the channels and the layout suits you then I don't know any reason not to use it.
2. All the numbered channels on the receiver will output a PWM signal. Typically for electric cars we power motors with electronic speed controllers, I'm not familiar with the PWM boards you mention, perhaps this is a robotics thing? How many motors or servos in total are you working with?
3. I believe you can provide power to any of the sets of pins on the receiver, so if you do use an ESC this will provide power to the receiver and the rest of the channels. If you aren't using an ESC, you can connect a battery to one of the pin sets instead.
4. Not sure about legality, but usually there are design difference between air/surface radios. As you mention, the Radiolink receivers are advertised for ground and air, with a shorter range listed for ground use (500m). Usually aircraft need more channels and compact, lighter receivers. This leads to the in-line receiver design like your R8EF. The T8S looks to be designed primarily for drone racing, but if you need all the channels and the layout suits you then I don't know any reason not to use it.
After looking at the receiver end, I saw that all ground pins on servo out are tied together, so are the VCC pins. Also in one of the vids on how to bind this receiver, I can see that person first plugged power into servo ch 8 out. So I tried that as well, and it worked for me. I guess if all pins are tied and I want to use all 8 channels, I just feed Vcc and Gnd into one of the servo out as a split.
Also, PWD (pulse width modulated) speed control is something that RC people call "ESC", it comes with a typical three pin connector that I just plug into any channel out on the receiver. I've yet to try that, but I'm sure it would work and I guess they come in various wattage designation and separate power connectors in and motor connector out. That makes sense now, I just had no idea what it was or what to look for, but now I can search RC ESC and I'm all set.
My application isn't complicated, I just wanted to control speed of motor to drive a car and a servo to control steering and I can see how this could be done now.
I did some RC planes a while back, way back when a lot of radios were stupid expensive (the cheapest ones, there are still expensive radios on high end) so that's where I was coming with, about remembering that air had separate radios and probably because they were longer range, running a car nearby and by mistake taking the same frequency (there was a time when you marked your freq on a board at a flight field before taking off) could make the plane misbehave.
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