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Power supply voltage : 3.3V.(if the modules working long hours in emission state, suggested that when the power supply voltage is greater than 4.5 V
you need concatenating a 1N4007 diode to avoid module built-in LDO got fever)
Default communication distance : about 1000 m (communication distance is adjustable up to 1000 m, air baud rate 5000 BPS).
Default idle current: 16 ma (modules in different working mode of different current).
Module size: 27.8mm*14.4mm*4mm.
Operating frequency range (433.4 473.0 MHz, as many as 100 communication channel) maximum 100 mw fired power (can be set)
Module supporting software upgrades.
Default factory Settings: working mode FU3, baud rate 9600 BPS, communication channel CH001 (433.4 M)
Packing included:
1* 433Mhz SI4438 Wireless Module Serial Port 1000M HC-12
Actual Customer
Reviewed in the United States on March 1, 2025
I got this to talk to a WVC300 inverter. It works, I can get stats from the inverter, but not reliably.The inverter is about 50ft away in this case and it does seem like you have to send a bunch of commands to "wake it up" before it starts responding reliably, but it's still not 100% reliable. I can't imagine getting anything @ 1000ydsThe antenna does not come attached, have to solder it on yourself. Maybe range would be improved with a better external antenna, but it gets the job done for me.
Old Nerd
Reviewed in the United States on October 31, 2024
I am really having trouble getting my head around these things. I have managed somehow to get my hands on 5 of them that work. That's through about 5 different orders to different sellers on amazon. In every single case I get some "dead soldiers".HiLetgo has been my go-to for arduino nanos and I've had good luck w/ them so I bought one of these thinking "it's more expensive than many of the others but if it works I guess I'm happy".Sadly I am not happy: I have a small pile of HC-12 modules that exhibit the following symptoms:1) Connected to an ftdi breakout thing powered by either 3.3v or 5v (I have tried both) with a cap on the power leads, I can without fail get into configuration mode and make configuration changes that persist.2) Out of configuration mode however, they don't seem to actually be able to talk to anything.Such is the case with this one. I'm very disappointed.
Dev Gualtieri
Reviewed in the United States on October 23, 2023
I've used quite a few of these interfaced to microcontrollers and Raspberry Pis. Just be careful to use logic level-shifters if interfacing with a 3.3 volt system when powered with a 5 volt supply. These have good range (tested at 50 feet from inside a house to outdoors),
Mark M.
Reviewed in the United States on August 29, 2020
You can literally solder this up to an arduino and transmit straight to another unit. It’s simple and not very complicated. The harder bit is programming them with the channels and modes you want. Just remember the set pin is a pull down so to make it receive commands you just connect it to the ground.
Customer of Stuff
Reviewed in the United States on May 16, 2020
These things are incredibly easy to use and work super far. The spec sheet recommends using a 1N4007 diode to VCC to drop voltage below 4.5v if you are powering it with a 5V source. It also recommends using a 220uF capacitor on the VCC and GND pins. I noticed it worked better when I installed these two things on it. These opened up so many fun project possibilities for me and I’ve purchased like 10 of these so far. No regrets
Blue Green
Reviewed in the United States on January 5, 2019
This is an awesome transceiver that makes sending and receiving data over longer distances easier. Also this is much more straightforward to code then using WiFi chips. You just pick a band and baud rate and send the message vs WiFi which you have to connect to an access point and all. I wish they we a bit less expensive like WiFi chips but totally worth it.
Maury
Reviewed in the United States on April 28, 2019
When I first got these, they would not communicate. However, after I found several errors in my code, they worked like a champ. Haven’t done any distance testing, but plan to. I am not using the coil antenna, but an SMA antenna with an ipex connection. They are easy to hookup since they use only two data pins. I have read that they should have a power supply separate from USB connections, but I plugged them into the 5V pin and ground on my Arduino, and they are O.K. Also, read that they need to be several meters apart, but my testing had all been done with then about 5 in. (About 12 cm.) apart. To find documentation I just searched “hc-12 Arduino” on the internet and a number of articles popped up.
Heriberto Castillo
Reviewed in the United States on September 1, 2017
Proof of concept project works, they communicate one to another, I'm yet to test the communication at 300 Yards as its a requirement for the project I'm working on. I would have liked to have the option of purchasing with the pins already soldered.
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