DIY Mobile Phone with Arduino Nano

Yes! it is as simple as it sounds. You can build your own Phone using SIM800L module and Arduino Nano. You are free to use any SIMcom version of GSM module and any version of Arduino. The Program I have written can be used with any combination as long as pin configuration is same.

All you need

• Arduino Nano
• SIM800L module
• 3.7v 1200mah Li-ion Battery
• TP4056 Battery Charging Module with Protection
• LEDs and 1K Registers (choose correct register for a LED)
• PAM8403 5V Digital Audio Amplifier Module (optional)

I have custom printed a multi purpose PCB for projects like this. But you can do it on bread board also. The connection diagram will be same as follows compatible with my written Program.

If you are really interested in how there are some links to checkout below

How does GSM Module work?

How does Software Serial work?

Ceramic Capacitor Codes

 Capacitor Codes:

Picofarad(pF)	Nanofarad(nF)	Microfarad(uF)	Code
10	0.01	0.00001	100
15	0.015	0.000015	150
22	0.022	0.000022	220
33	0.033	0.000033	330
47	0.047	0.000047	470
100	0.1	0.0001	101
120	0.12	0.00012	121
130	0.13	0.00013	131
150	0.15	0.00015	151
180	0.18	0.00018	181
220	0.22	0.00022	221
330	0.33	0.00033	331
470	0.47	0.00047	471
560	0.56	0.00056	561
680	0.68	0.00068	681
750	0.75	0.00075	751
820	0.82	0.00082	821
1000	1	0.001	102
1500	1.5	0.0015	152
2000	2	0.002	202
2200	2.2	0.0022	222
3300	3.3	0.0033	332
4700	4.7	0.0047	472
5000	5	0.005	502
5600	5.6	0.0056	562
6800	6.8	0.0068	682
10000	10	0.01	103
15000	15	0.015	153
22000	22	0.022	223
33000	33	0.033	333
47000	47	0.047	473
68000	68	0.068	683
100000	100	0.1	104
150000	150	0.15	154
200000	200	0.2	204
220000	220	0.22	224
330000	330	0.33	334
470000	470	0.47	474
680000	680	0.68	684
1000000	1000	1	105
1500000	1500	1.5	155
2000000	2000	2	205
2200000	2200	2.2	225
3300000	3300	3.3	335

Pass Filter Resonant Frequency

Quick Calculate:

R1 Ω   C1 pF
R2 Ω   C2 pF    

R1(Ω)	C1(pF)	R2(Ω)	C2(pF)	Hz
100000	10	100000	10	159.15 KHz
100000	15	100000	15	106.1 KHz
100000	22	100000	22	72.34 KHz
100000	33	100000	33	48.23 KHz
100000	47	100000	47	33.86 KHz
100000	100	100000	100	15.92 KHz
100000	120	100000	120	13.26 KHz
100000	130	100000	130	12.24 KHz
100000	150	100000	150	10.61 KHz
100000	180	100000	180	8.84 KHz
100000	220	100000	220	7.23 KHz
100000	330	100000	330	4.82 KHz
100000	470	100000	470	3.39 KHz
100000	560	100000	560	2.84 KHz
100000	680	100000	680	2.34 KHz
100000	750	100000	750	2.12 KHz
100000	820	100000	820	1.94 KHz
100000	1000	100000	1000	1.59 KHz
100000	1500	100000	1500	1.06 KHz
100000	2000	100000	2000	795.77 Hz
100000	2200	100000	2200	723.43 Hz
100000	3300	100000	3300	482.29 Hz
100000	4700	100000	4700	338.63 Hz
100000	5000	100000	5000	318.31 Hz
100000	5600	100000	5600	284.21 Hz
100000	6800	100000	6800	234.05 Hz
100000	10000	100000	10000	159.15 Hz
100000	15000	100000	15000	106.1 Hz
100000	22000	100000	22000	72.34 Hz
100000	33000	100000	33000	48.23 Hz
100000	47000	100000	47000	33.86 Hz
100000	68000	100000	68000	23.41 Hz
100000	100000	100000	100000	15.92 Hz
100000	150000	100000	150000	10.61 Hz
100000	200000	100000	200000	7.96 Hz
100000	220000	100000	220000	7.23 Hz
100000	330000	100000	330000	4.82 Hz
100000	470000	100000	470000	3.39 Hz
100000	680000	100000	680000	2.34 Hz
100000	1000000	100000	1000000	1.59 Hz
100000	1500000	100000	1500000	1.06 Hz
100000	2000000	100000	2000000	0.8 Hz
100000	2200000	100000	2200000	0.72 Hz
100000	3300000	100000	3300000	0.48 Hz

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The above table can be used for first Order any Order Pass filter 
Based on

f = 1 / 2π√(R1*C1*R2*C2)

if C1 = C2 and R1 = R2

f = 1 / 2πRC

Let's take an example of a Low Pass filter, let's say values are
R1 = 1000000 Ω
R2 = 1000000 Ω
C1 = 100000 pF
C2 = 100000 pF
Then cut-off frequency would be 15.92 Hz.

The roll-off behavior for high frequency would be

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For additional information on all standard Ceramic Capacitor Codes.

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Water Level Indicator with Auto AC Switch control

Here is the water Level Indicator with Auto AC Switch control.

https://appliedec.blogspot.com/p/the-water-level-indicator-circuit-is.html

MuleSoft Quiz - 1

MuleSoft Quiz is s quiz compiled with quiz questions from MuleSoft training DIY exercises along with more questions.
MCD - Level 1 / Development Fundamentals (Mule 4) Quiz & DIY Exercises
Introducing Application Networks and API-Led Connectivity
Practice the above quiz and comment your experience.
Thanks