Category Archives: Electronics

GPS team tracker

Arduino Electronics No Comments

Using the combination of a ESP32, nRF24L01+, fullcolor OLED display and a GPS module to create a low cost wireless tracking system.

Tracker screen.
The blue circle is a team member.

Players screen (for debugging).
Up to 10 players can be tracked.

GPS screen
Show satellites used for positioning with their SNR

HC05 Bluetooth Transceiver Module RS232 / TTL

Arduino Bluetooth Electronics Raspberry pi No Comments

 

Today we received some HC05 bluetooth serial modules from asia. It’s a very cheap solution to enable bluetooth on your device, it can be found on ebay for around $1. It’s  Bluetooth v2.0 compatible and requires almost no components to connect to an arduino or raspberry pi.

Setting up a connection with another device (smartphone) is very easy. only 4 wires and 2 resistors (for voltage level correction) are required to connect it with an arduino.

CSR BC417143B datasheet

HC05

at_mode_sch

 

AT Commands used by HC-05 & HC-06 and most of other Bluetooth Devices

COMMAND FUNCTION 
1 AT 			Test UART Connection 
2 AT+RESET 		Reset Device 
3 AT+VERSION 		Querry firmware version 
4 AT+ORGL 		Restore settings to Factory Defaults 
5 AT+ADDR 		Query Device Bluetooth Address 
6 AT+NAME 		Query/Set Device Name 
7 AT+RNAME 		Query Remote Bluetooth Device’s Name 
8 AT+ROLE 		Query/Set Device Role 
9 AT+CLASS 		Query/Set Class of Device CoD
10 AT+IAC 		Query/Set Inquire Access Code 
11 AT+INQM 		Query/Set  Inquire Access Mode 
12 AT+PSWD 		Query/Set Pairing Passkey 
13 AT+UART 		Query/Set UART parameter 
14 AT+CMODE 		Query/Set Connection Mode 
15 AT+BIND 		Query/Set Binding Bluetooth Address 
16 AT+POLAR 		Query/Set LED Output Polarity 
17 AT+PIO 		Set/Reset a User I/O pin 
18 AT+MPIO 		Set/Reset multiple User I/O pin
19 AT+MPIO? 		Query User I/O pin 
20 AT+IPSCAN 		Query/Set Scanning Parameters 
21 AT+SNIFF 		Query/Set SNIFF Energy Savings Parameters 
22 AT+SENM 		Query/Set Security & Encryption Modes 
23 AT+RMSAD 		Delete Authenticated Device from List 
24 AT+FSAD 		Find Device from Authenticated Device List 
25 AT+ADCN 		Query Total Number of Device from Authenticated Device List
26 AT+MRAD 		Query Most Recently Used Authenticated Device
27 AT+STATE 		Query Current Status of the Device 
28 AT+INIT 		Initialize SPP Profile 
29 AT+INQ 		Query Nearby Discoverable Devices 
30 AT+INQC 		Cancel Search for Discoverable Devices 
31 AT+PAIR 		Device Pairing 
32 AT+LINK 		Connect to a Remote Device 
33 AT+DISC 		Disconnect from a Remote Device 
34 AT+ENSNIFF 		Enter Energy Saving mode 
35 AT+EXSNIFF 		Exit Energy Saving mode

more info:

Quiz system with an arduino

Arduino Electronics No Comments

Created a quiz system for playing a party game with 2 teams.

Each team has a box with 4 dome push buttons (sparkfun), so the game can use multiple choice questions.

Each box is connected to the arduino uno that is controlling the detection of the button presses and for giving light feedback. A laptop connected to this arduino is running the game coded in C#/WPF.