This experiment was bit delayed due to lack of libraries for RS485 for Arduino. After lots of frustrations, i manage to make it work with soft-serial. Master controller send the command in bytes with [slaveid,status,level] and when a specific id slave response to it and lit and LED. Level byte is an analog value sent by master to dim the LED. RS485 is a long distance communication protocol which is used is several industrial applications so it can be used to monitor and control devices in a twisted pair network.
Since everyone is interested in this post and lots of request comes to get the firmware, i have put a link so that everyone can download it easily. SIMCOM 900A firmware
Its been a while that i was trying to fix the SIM900A GSM module. This module support local GSM band but after some researches it was concluded that it is carrier locked :(. After long conversion of days to actual chip manufacture SIMCOM, they told it can be fixed by updating its firmware to latest original version but unfortunately they don't provide firmware to small parties.
I never stop trying to get the firmware and SIMCOM again replied, this time they said contact local SIMCOM supplier and request for firmware. But this little Maldives don't have SIMCOM or any electronics manufacturer. So i contacted my friend coody from NOA LABS/Smart prototyping (a friend in china) and told him to help me. I explained him what to do so he can communicate with SIMCOM in china.
Its been a while i have this LCD and today i thought of connecting the LCD display to Arduino. Unfortunately i could not found any pin outs of this from any where and from the manufacture. Actually this is very old model which i got from old FAX machine and this display is a very cheap from online sources.
Clover Display M302 PCB Ver 1.0 (16x2) which has 10 pin flat cable. After researching for a while from the internet i have seen in many forums people are asking for help on how to connect it and what is the pin configurations? so i thought of helping them as well as my self at the same time.
After going through some of my old collections of Russian data of displays and things i found a basic diagram of how 10 pin LCD display configuration.
PIN1 - VSS
PIN2 - VDD
PIN3 - CONTRAST
PIN4 - RS
PIN5 - R/W
PIN6 - ENABLE
PIN7 - DB4
PIN8 - DB5
PIN9 - DB6
PIN10 - DB7
I tried these configurations and wired up to the arduino with the LCD sketch and it worked on the first try. …
Its been a while i was searching for a cheap wifi module and with the help of smart-prototyping.com, i was able to get a module almost less than USD 5.
To connect the module to breadboard for prototyping, i made a small jig to interconnect with the board easily. So i can wire up the device and interface anything to GPIO's.
Be careful with the module cause the device it powered with 3.3V and both UART side levels will be 3.3V so i recommend to use a FTDI converter with 3.3V level select.(one i used can select 3.3 and 5 volts) if you connect 5V the module will fry up. If you have 5V or 12V supply to power up the module i suggest to use LD1117V33 to make 3.3V.
The stock Firmware in the ESP8266 supports AT commands and for communicating with this need an micro-controller like Arduino. But i want to make a simple solution for that without using external micro-controller. NodeMCU firmware was the best thing i found. To upload the NodeMCU firmware please do a google search, there are tons o…