Microsecond latency, wireless communication solution

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Microsecond latency, wireless communication solution [Copy link]

I am working on a project with relatively simple functions. It mainly transmits a switch signal wirelessly. The distance is very short (within 10 meters). However, because it is on the walking mechanism, it is not convenient to wire. Therefore, a wireless solution is needed, and the total delay of this signal transmission needs to be less than 200μs. I initially wanted to use NRF2401+. According to the data sheet, the setting process of sending data from standby to TX takes 130μs. After consulting the module manufacturer, the delay of the entire process of transmitting + receiving is in the ms level, which cannot meet the requirements. I have read the manuals of CC1101 and HY-620201, but I don’t seem to see any parameters about the specific delay. I would like to ask the big guys if there is any low-latency wireless communication solution for reference.

dcexpert

General RF chips should not be able to achieve

火山黄灰红

dcexpert posted on 2019-5-23 11:28 General RF chips should not be able to achieve this

Thanks for the reply. I have only used NRF2401+ before, and the applications I made were relatively simple. I don’t know much about this. Which wireless solution has the smallest relative delay?

chunyang

All digital wireless chips used to transmit data are not available and cannot meet the delay requirements. Only pure analog channels can be used, and the local oscillator must continue to work, only controlling the output. The disadvantage is that it is easily interfered, especially in industrial sites. For such requirements in industrial sites, it is best to use photoelectric switches, which have strong anti-interference capabilities after optical signal modulation.

lcn1992

Recently, our company also needs to use invalid low-latency transmission, which is required to be within 2ms. I have tested it with NRF24L01+. It takes about 900us from the start of sending to the completion of receiving. The transceiver modules are close together. If a packet is lost, the time may exceed 2ms, which seems unreliable.

火山黄灰红

chunyang posted on 2019-5-23 12:21 All digital wireless chips used to transmit data are not available, and the delay requirements cannot be met. Only pure analog channels can be used, and the local oscillator must continue to work. Only...

In addition to the low latency indicator, there are also issues such as battery life. If you don't use a finished communication module, the cost and development difficulty are too high. It's just a small application project, and I only consider choosing conventional modules on the market.

火山黄灰红

lcn1992 posted on 2019-5-23 13:05 Recently, our company also needs to use invalid low-latency transmission, which is required to be within 2ms. I have tested it with NRF24L01+, from the beginning of sending to receiving...

This data is very useful, and it can quickly determine the feasibility

chunyang

Huoshan Huanghuihong published on 2019-5-23 13:48 In addition to the low latency indicator, there are also issues such as battery life. If you don't use a finished communication module, the cost and development difficulty are too high. It's just...

The modules on the market are all used to transmit data, not to adapt to your application. The only finished product that may be used is the remote control module, which has the lowest latency for model aircraft.

JSXD

You can consider the low-frequency 433/315M super-regenerative module, which has pure analog circuit transmission and strong low-frequency penetration ability, which should be able to meet your needs. You can also consider other aspects of performance comprehensively.

火山黄灰红

JSXD Published on 2019-5-23 15:46 You can consider the low-frequency 433/315M super-regenerative module. It has pure analog circuit transparent transmission and strong low-frequency penetration ability, which should meet your needs. It...

Thanks for your advice. I found some information on super-regeneration and super-heterodyne on the Internet. I don’t know much about RF. Will using PT2272 and PT2262 increase the processing time?