hello, can someone please help me?  - Page 1
Forum section: electronics / beginners

author: hummerjanne
author_rank: Regular Contributor
timestamp: March 11, 2023, 08:15:14 am
content: hello, can someone please help me? The remote control of my hummer rc car is lost and I don't know the frequency range. my question is can i make a new remote control or how can i find the frequency and what are the connection places of the wires coming out of the car i can't find the places where the car wires brokeThe integrated and relay coming out of the top of the motherboard is TL TR6-A flat plug DIP-18 foot IC integrated block circuit chip SANYOU relay SRD-S-109D

author: jpanhalt
author_rank: Super Contributor
timestamp: March 11, 2023, 08:47:49 am
content: I doubt you could design and make a new RC transmitter if it had proportional control. That is, you could control the amount of turn. Even without proportional control, you would need to comply with the frequency and testing requirements of your government.Very short range at some frequencies is relatively unregulated in the US. Some inexpensive Chinese imports use very short range 27 MHz (e.g, 27.225 MHz) transmitters. Some even use IR. Government regulations vary quite a bit, so be sure what you plan to do is legal.I would just get another RC car and transmitter that uses the same transmitter. Then you will have two cars.

author: pcprogrammer
author_rank: Super Contributor
timestamp: March 11, 2023, 09:37:10 am
content: Hi hummerjanne,welcome to the forum.A couple of pointers, when starting a topic you will get better responses when you choose a proper subject, like in your case "Replace transmitter for remote controlled hummer" would be more indicative as to what the thread is about.Secondly, to receive better responses you have to provide a better description of the problem. For instance some pictures of the car and the circuit board that sits in it. Or the brand name of the car, etc.You did not provide much to work with, so you won't get very good responses.

author: jpanhalt
author_rank: Super Contributor
timestamp: March 11, 2023, 12:26:38 pm
content: The only thing I could find with a quick check for "gaoyin" shows the attached picture for the transmitter and a 1:8 scale. Was yours that big? The antenna is suggestive that it is not 2.4 GHz, but rather one of the megahertz frequencies in the 50 to 75 MHz range or perhaps in the 27 MHz band. I consider 27 MHz unlikely given its apparent complexity and cost.In either case: 1) You have the licensing problem. Some countries can be very nasty to violators. I don't know about Guatemala, but Saudi Arabia for example has a reputation for being that way. 2) It will have a microcontroller in it. Do you know how to write the code that would be needed? 3) The label on the Hummer may show its frequency, but I think that is irrelevant as I don't think a DIY build is likely to work out for you.I would try to find the original transmitter as it may have a a specific channel for the Hummer (assuming it is not 2.4 GHz). Alternatively, try to find a used transmitter. If you knew more about the control, you might find a generic RC transmitter on the right frequency that would work. Was the transmitter actually lost or was it destroyed. If the latter, there may be enough information on it to find a replacement, e.g., the equivalent of the US FCC sticker.

author: hummerjanne
author_rank: Regular Contributor
timestamp: March 11, 2023, 01:02:19 pm
content: same as in the picture yes right let me go 3 meters away the remote doesn't work

author: hummerjanne
author_rank: Regular Contributor
timestamp: March 11, 2023, 01:07:35 pm
content: 1 : 8 High Simulation Large Remote Control HummerHummer H2 super SUV cross country remote control car! 1 to 8 full true sizes! Ultra-strong force, the use of industrial motor drive 380, the speed cannot be compared with other similar remote control cars, the car loaded with super-strong headlight lighting, double screen width light, tail light, front and rear ceiling light and synchronized turn signal steering, an independent audio system and four-color sound light, simulation Hummer exclusive "bunker" sound system, a built-in DISC music can also be directly connected to your MP3 or DISCMAN, play your favorite music, simulation engine start and idle sound, cabin door opening and closing by remote control, multi directional remote control, joystick type hand-held remote control, extremely flexible. Main Features

author: jpanhalt
author_rank: Super Contributor
timestamp: March 11, 2023, 01:15:35 pm
content: 3m range implies very low power. It's not 2.4 GHz, but might even be another band like for garage door openers. My previous guess of 50 to 75 MHz was based on standard frequencies used in the US for RC model airplanes and cars at longer ranges. 50 MHz (6-meter band) required a "ham" license.

author: pcprogrammer
author_rank: Super Contributor
timestamp: March 11, 2023, 01:57:46 pm
content: Not a lot that can be found online about it. And like jpanhalt indicated it can be a transmitter on different frequencies. The remote shows 6 function for as far as I can tell, so could be a simple 27MHz old style transmitter, but could just as well use some newer modulation technique or other frequencies.https://cheezyn.pk/hummer-h2-suv-rc.htmlhttps://www.worthpoint.com/worthopedia/rc-radio-remote-controlled-hummer-h2-73752029Also found this one but seems to be smaller. Remote looks the same though.https://www.visazero.com/jouets-loisirs/2123-hummer-h2-suv-rc-car.html

author: hummerjanne
author_rank: Regular Contributor
timestamp: March 11, 2023, 02:09:05 pm
content: thank you very much yes it is the same remote 27 mhz or 75 mhz can another remote do the same work can i try

author: jpanhalt
author_rank: Super Contributor
timestamp: March 11, 2023, 02:20:32 pm
content: Walmart seems to sell or at least sold much the same but maybe smaller. Doesn't say much about the frequency. A cheaper version with a 27 MHz transmitter is also shown.https://www.walmart.com/ip/Buy-Wonder-Products-Licensed-Hummer-H2-SUV-Car-1-12-Scale-Full-Funtion-4-Channel-Remote-Control-GK-Racer-in-Red/70833051127 MHz, but different style transmitter:https://www.walmart.com/ip/Wonderplay-1-16-R-C-Car-27MHZ-Hummer-five-way-automatic-door-remote-control-car-front-light-4xAA-rechargeable-battery-pack-charger-requires-2-AA-not-/341218202

author: jpanhalt
author_rank: Super Contributor
timestamp: March 11, 2023, 02:28:08 pm
content: If yours is 75 MHz, another transmitter on 75 MHz MAY work. You might have to change a crystal to get the right frequency channel. The 27 MHz versions seem to have simpler controls and it is unlikely you could change them to work with your 75 MHz car. If your car is 27 MHz, then using that might work.Does your car have proportional control or does, for example, left give full left. Proportional means if you turn a little left, then the wheels turn just a little. If you command more left, the wheels turn more.

author: hummerjanne
author_rank: Regular Contributor
timestamp: March 11, 2023, 04:59:30 pm
content: no there is no proportionality, i have to turn it exactly but it moves like that

author: jpanhalt
author_rank: Super Contributor
timestamp: March 11, 2023, 05:17:17 pm
content: Okay, that's a very simple radio -- maybe even 27 MHz.Do you have any friends with similar RC cars or stores that have them on display? It is possible that even the second car listed earlier at Walmart would work. If you can find one on display, you could test before buying.I still think designing and building a transmitter is not a reasonable endeavor. Now, if you find a TX that works, you might find plans and be able to duplicate it.However, if it is one of those very inexpensive 27 MHz transmitters, you can probably buy a used one for much less than the parts would cost.Are there any RC clubs in your area? They often have older members who will just give away such old equipment. That's how I got rid of all of my old stuff.

author: antenna
author_rank: Frequent Contributor
timestamp: March 11, 2023, 05:21:25 pm
content: Do you have a picture of the receiver in the car (both sides please)? A look at the receiver board's tuned circuit would give a pretty strong hint toward the frequency of operation. A picture of the receiver IC might offer a hint toward the modulation or signalling used too. The transmitter is probably a simple LC oscillator modulated by an audio oscillator and the receiver uses a similarly simple LC tuned receiver followed by a tone decoder chip to signal the drive/turn transistors.Have you tried the RCGroups forum?Talkingelectronics has really cheap and simple RC transmitter and receiver projects with schematics, and knowing china, they probably nicked the circuit from there lol.

author: hummerjanne
author_rank: Regular Contributor
timestamp: March 11, 2023, 05:50:34 pm
content: role SANYOU role SRD-S-109D

author: hummerjanne
author_rank: Regular Contributor
timestamp: March 11, 2023, 06:03:21 pm
content: Control 27mhz, I'm probably going to try the roles that caught my attention. There is a role in the motherboard of the car, but does it have to be a role in the transmitter, but the role is not used in those visuals, there are some ready-made cards on the internet, 4-channel 27 mhz yes it works

author: antenna
author_rank: Frequent Contributor
timestamp: March 11, 2023, 06:12:37 pm
content: I cannot read spanish, but the schematics are there.https://reparar-cochesrc.blogspot.com/2018/12/coche-nikko-120-6-funciones.htmlthey even have a schematic of the transmitter and scope pictures of the modulation waveform given to the 27MHz oscillator (on-off keying of the RF with those waveforms)

author: antenna
author_rank: Frequent Contributor
timestamp: March 11, 2023, 06:21:13 pm
content: What do you mean by "role"?

author: hummerjanne
author_rank: Regular Contributor
timestamp: March 11, 2023, 06:23:42 pm
content: I'm sure it's 27 mhz now, but it's confusing to open and close the doors of the car, when I press the button, the door closes when I press the button again.

author: hummerjanne
author_rank: Regular Contributor
timestamp: March 11, 2023, 06:25:20 pm
content: so a 27 mhz 4 channel card works, it's true, but I just can't open and close the doors

author: hummerjanne
author_rank: Regular Contributor
timestamp: March 11, 2023, 06:30:57 pm
content: now working with 27 mhz 4 channel remote

author: jpanhalt
author_rank: Super Contributor
timestamp: March 11, 2023, 06:33:41 pm
content: That big IC NIKKO 2061D is an RC chip:http://robots.freehostia.com/Radio/RadioBody.html(NJM2061D is another number)It does not seem to be available to find its datasheet. Maybe search with something besides Chrome would help. In any event the coil near the left the the board is for tuning.

author: jpanhalt
author_rank: Super Contributor
timestamp: March 11, 2023, 06:34:22 pm
content: Quote from: hummerjanne on March 11, 2023, 06:30:57 pmGood

author: antenna
author_rank: Frequent Contributor
timestamp: March 11, 2023, 11:54:23 pm
content: I've read that this particular IC is application specific (so no datasheet). It looks like the left/right forward/back is done with low and high duty cycle PWM signals. Why not put that duty cycle into a signal generator and vary the modulating frequency until the doors pop? I bet it will be some in between 600Hz or whatever at the same high/low duty cycle = left door right door kind of thing.

author: pcprogrammer
author_rank: Super Contributor
timestamp: March 12, 2023, 06:26:04 am
content: Quote from: antenna on March 11, 2023, 06:12:37 pmThe schematics do look like they are for this one, but miss the additional controls. Only forward, backward, left and right are available. But it indeed looks like simple old style remote control.The fact that it works with a 4 channel transmitter, without going of the rails with random like behavior, makes me believe they use the extremes of one channel for forward/backward and the extremes of another for left/right. This leaves the extremes of the other two channels for the control of the other functions.With the extremes I mean the minimum and maximum of the pulse width normally used for this type of remote control. RC servo's can work on these signals. Minimum is 1ms and max is 2ms.So maybe it is possible to modify the transmitter to send the right pulse widths for opening and closing the doors.

author: hummerjanne
author_rank: Regular Contributor
timestamp: April 03, 2023, 09:30:37 am
content: It works between 27 mhz and 49 mhz, I understood it for sure. It is a rocker type remote control and it is multifunctional. Something caught my attention, they did not use a crystal oscillator.

author: hummerjanne
author_rank: Regular Contributor
timestamp: April 03, 2023, 09:32:38 am
content: receiver has this antenna connected to it Use frequency band: 27MHz/49MHzMaximum speed: 6.5KM/HRemote control distance: about 60 metersBatteries used: car body rechargeable battery pack, 6 x 1.5V AA batteries for remote controlVersatile actions: forward, backward, turn left, turn right, stop, horn, door open, sound and light function, external MP3 can be connected[Product Color]: Goose Down Yellow, Deep Sea Black, Metallic Red (Unspecified colors will be sent at random)[car accessories]: car rechargeable battery, charger, telescopic antenna, user manual, MP3 connectorAutomatic simulation sound system When the Hummer switch is turned on, the Hummer will make an engine roar and continue to simulate the sound of the engine.When the vehicle is moving forward, the vehicle makes an acceleration sound Brake sound when parking Reversing alarm sound Press the remote control horn buttonDriven by the industry grade 380 engine, the speed is not the same as other similar remote control cars. Super strong headlight illumination, double-width headlights, taillight illumination, front and rearThe courtesy light and turn signal synchronized with the steering wheel, the car is equipped with an independent sound system, and there is a special simulating 4-color sound light.The BOSE "Bunker" sound system has built-in DISCO music and can be connected directly to your MP3 or DISCMAN to play your favorite music.Simulate music, engine start and idle sound, cabin door can be opened and closed by remote control, versatile remote control, rocker type two-handed remote control, highly flexibleIt is convenient to work, its body is resistant to crashes, the high-security safety bar protects the front of the Hummer. It has built-in rock songs. It can be opened with a remote control (Note: other songs cannot be written).Audio cable is also supplied with the car. Buyers can connect the output port of their favorite MP3, radio, tape deck and other players to the input port in the car.Play music. You can even connect the computer's sound card output to the Hummer to use it as a speaker.