NRF24L01 is low cost transmitter that can be used in arduino through SPI interface, the price of this device is only $0.95 in Indonesia , this device uses 3.3V power supply which can be obtained from 3.3V pin on arduino.

If you Bought this device, maybe you will get the experience that this device not works, although your program seemed correct. This problem is make me confused, because i bought six pcs NRF24L01 and none of them are work.

Then i found the solution from the forum ( Sorry i forgot the link) that says that we must add 10uF capacitor on Vcc and Ground.. this is caused by the noise of Power supply when transmitting prosess. After i put the capacitor.. NRF24L01 is works perfectly..

## Sunday, February 19, 2017

## Wednesday, April 29, 2015

### How To Update Workspace Variabel By Using Simulink

Anytime, we need to update variabel in Workspace by using simulink, there is some way to do it. you can use

To Update Workspace variable with Single Value by using simulink. you need

assignin(ws, 'var', val)

**you can type doc assignin for explanation about it

for example you want update Kp variable in workspace, then you can type the following script in matlab interpreted function

Kp_value =2;

assignin('base', 'Kp_m', Kp_value );

**To Workspace**Block in simulink, there is disadvantage if we use this block. this block will update workspace varible in time array. it will result the array variable in workspace, so for you who want update workspace only single value, you can not use**To Workspace**Block.To Update Workspace variable with Single Value by using simulink. you need

**Interpreted MATLAB Function**block. and use the following scriptassignin(ws, 'var', val)

**you can type doc assignin for explanation about it

for example you want update Kp variable in workspace, then you can type the following script in matlab interpreted function

Kp_value =2;

assignin('base', 'Kp_m', Kp_value );

## Tuesday, April 28, 2015

### Matlab: How To Plot Data Array to Bode Diagram

There is numorous research that need us to plot Bode Diagram, using the usual way, we can plot bode diagram easily using matlab command bode(sys). where sys is transfer function.

Unfortunately, we didnt know the transfer function of our system, maybe because of nonlinearity or system is too complex to convert to transfer function.

What we have is only the data, then we can convert the data to bode diagram. Lets see the following example

data=[10 0.0911222683470981 -1.58847081420007

17.1132830416178 0.155513705289354 -1.59826007442724

29.2864456462524 0.265372788697364 -1.61337362876168

50.1187233627272 0.452875507309409 -1.63924925736688

85.7695898590894 0.771380837522393 -1.6844579215245

146.779926762207 1.30422486175599 -1.76177744417405

251.188643150958 2.15885228954428 -1.88922949657677

429.866234708228 3.38909945622017 -2.08389456518048

735.642254459642 4.79331476991719 -2.33778424860481

1258.92541179417 5.90723048305756 -2.59657088827632

2154.43469003188 6.51210885390879 -2.80121801151038

3686.94506451958 6.76551329794937 -2.93773717631133

6309.57344480193 6.85906013908311 -3.02175637289138

10797.7516232771 6.89190068991012 -3.07200435455205

18478.4979742229 6.9032185997441 -3.10201666772075

31622.7766016838 6.90708374137897 -3.12039586346281

54116.9526546464 6.90836924161824 -3.13252146311361

92611.8728128794 6.90870360455884 -3.14196763982071

158489.319246112 6.90851104747202 -3.15152485034634

271227.257933203 6.90754724630841 -3.16401689981387

464158.883361278 6.90459064111762 -3.18312952818843

794328.234724283 6.8959080205459 -3.21447528466877

1359356.39087853 6.87065827244468 -3.26713087846712

2326305.06715363 6.79832956499895 -3.35572740118132

3981071.70553497 6.59941778875662 -3.50204977064032

6812920.69057961 6.10718328006143 -3.73075734041662

11659144.0117983 5.13927320828323 -4.04839453004176

19952623.1496888 3.82351328567971 -4.42101649285181

34145488.738336 2.62807468084941 -4.80832034047117

58434141.3373518 1.83567026586748 -5.20125372342626

99999999.9999999 1.41059927338957 -5.58031981846252]

To Convert To Bode diagram, use the following Matlab script

f=log10(data(:,1));

gain=20*log(data(:,2));phase=data(:,3);

close;subplot(2,1,1);plot(f,gain);

xlabel('frequency log10(\omega)');ylabel('Gain(dB)');title('Amplitude')

subplot(2,1,2);plot(f,phase);

xlabel('frequency log10(\omega)');ylabel('Phase(rd)');title('Phase')

Unfortunately, we didnt know the transfer function of our system, maybe because of nonlinearity or system is too complex to convert to transfer function.

data=[10 0.0911222683470981 -1.58847081420007

17.1132830416178 0.155513705289354 -1.59826007442724

29.2864456462524 0.265372788697364 -1.61337362876168

50.1187233627272 0.452875507309409 -1.63924925736688

85.7695898590894 0.771380837522393 -1.6844579215245

146.779926762207 1.30422486175599 -1.76177744417405

251.188643150958 2.15885228954428 -1.88922949657677

429.866234708228 3.38909945622017 -2.08389456518048

735.642254459642 4.79331476991719 -2.33778424860481

1258.92541179417 5.90723048305756 -2.59657088827632

2154.43469003188 6.51210885390879 -2.80121801151038

3686.94506451958 6.76551329794937 -2.93773717631133

6309.57344480193 6.85906013908311 -3.02175637289138

10797.7516232771 6.89190068991012 -3.07200435455205

18478.4979742229 6.9032185997441 -3.10201666772075

31622.7766016838 6.90708374137897 -3.12039586346281

54116.9526546464 6.90836924161824 -3.13252146311361

92611.8728128794 6.90870360455884 -3.14196763982071

158489.319246112 6.90851104747202 -3.15152485034634

271227.257933203 6.90754724630841 -3.16401689981387

464158.883361278 6.90459064111762 -3.18312952818843

794328.234724283 6.8959080205459 -3.21447528466877

1359356.39087853 6.87065827244468 -3.26713087846712

2326305.06715363 6.79832956499895 -3.35572740118132

3981071.70553497 6.59941778875662 -3.50204977064032

6812920.69057961 6.10718328006143 -3.73075734041662

11659144.0117983 5.13927320828323 -4.04839453004176

19952623.1496888 3.82351328567971 -4.42101649285181

34145488.738336 2.62807468084941 -4.80832034047117

58434141.3373518 1.83567026586748 -5.20125372342626

99999999.9999999 1.41059927338957 -5.58031981846252]

To Convert To Bode diagram, use the following Matlab script

f=log10(data(:,1));

gain=20*log(data(:,2));phase=data(:,3);

close;subplot(2,1,1);plot(f,gain);

xlabel('frequency log10(\omega)');ylabel('Gain(dB)');title('Amplitude')

subplot(2,1,2);plot(f,phase);

xlabel('frequency log10(\omega)');ylabel('Phase(rd)');title('Phase')

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