Comparison test between 433MHz (CC1101) and zigbee (CC2530)
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The following are the test results of 433Mhz and zigbee. The modules purchased are all mainstream and most shipped modules from TI.
1.1 CC1101:
The communication frequency of CC1101 is 433MHz. Its advantages are long transmission distance, low transmission data rate, and strong diffraction ability, but it cannot form a network and its working mode can only be 1 point to multipoint. Influenced by the 433MHz adopted by other companies, we first tested CC1101.
The tested CC1101Mhz has a transmit power of 60mw and a standby power consumption of 10mw.
The indoor test distance is about 20m, and the outdoor test visible distance (without obstructions) is 100m.
Considering the working environment of small lamps, we tested the dense occlusion of plants. The test scenes are as follows:
It turned out that when there was a plant blocking the connection, the communication could not be stable within 5 meters. After the test, the friends were like this:
This was my mood for the whole day on Tuesday.
Through data collection and verification, we found that the visible distance of 433MHz can reach 2000m. We are also considering purchasing a high-power 433Mhz module, which has a transmission power of 300mW.
1.1.1 The friends further analyzed the reasons why solar street lights use 433Mhz:
1. At 433Mhz with a power of 300mW, the visible distance can reach 2000m and stabilize at 500m.
2. In the working environment of street lamps, the power consumption of 300mW may only account for 1% of the energy consumption of street lamps. According to the information provided, the power consumption of street lamps is between 15W and 160W, and the power consumption of 433MHz can be ignored.
3. The wireless installation of street lamps is relatively high and along the roadside. The installation height is consistent, the communication obstruction is small (although there will be trees, the obstruction will not be too large because the sky in the middle of the road is unobstructed), and the communication points maintain a straight line within a short distance. This is suitable for 433Mhz data communication.
1.1.2 Why 433Mhz is not suitable for small lights:
1. Transmission distance. In a one-to-many situation, all small lights face a centralized controller, but their ability to penetrate plant obstructions is weak. According to the test results above, they face the problem of communication blocking.
2. If the power is increased, the problem we face is the energy consumption of small lamps. The power consumption of small lamps is only 1-3W. If we use high-power 433Mhz, it is possible that the solar energy stored will be almost consumed by the wireless module.
The main problems faced by small lamps using 433mhz are: distance, environment, power consumption, and the most fatal problem is the environment. The environment is changeable and the flexibility of 1 to 1 point-to-point communication is too poor.
1.2 Zigbee CC2530
After getting ready, the friends conducted a simple networking test and point-to-point test on the Zigbee module on Wednesday, and bought a high-power 433Mhz module SI4463 online, just in case, because they did not have high expectations for Zigbee.
The test was first carried out in the office. The point-to-point straight-line distance was lower than 433Mhz and was stable within 80m. In the case of test networking, the networking modules could extend the wireless communication distance by packet jumping.
In the afternoon, we conducted outdoor tests, and specifically went to the 433Mhz test site for a second test. The results were satisfactory:
Around the plant, the Zigbee module can stably receive signals.
The test confirmed the guess that the 433Mhz wavelength has strong diffraction ability and is suitable for long-distance transmission, but its ability to penetrate objects is poor. However, Zigbee works at a wavelength of 2.4G, which has a short wavelength but strong direct penetration ability of objects.
At the same time, a simple 3-point networking test was performed on the Zigbee module, and the test results were relatively stable.
Each of the three points is 50m apart, and the data sent by the first point is stably received by the third point.
The form of sending network-hopping packets is very suitable for small lamps in changeable environments. In the case of obstruction by multiple plants, it can be bypassed through routing networking, which is a scientific solution.
question:
1. Power consumption: When Zigbee is working at 60mw, the distance is only stable at about 50m. As the backbone of the network, it cannot go into sleep mode.
2. Network scale.
Although there are still unknown problems, my friend's mood is like this. He can be sure to use the zigbee module and quietly return the module SI4463:
1.4 Summary:
It is technically difficult to maintain a stable wireless network under low cost, low power consumption and complex environment. The main unknowns currently faced are low power consumption, complex environment and stable networking.
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