https://www.circuitlab.com/
Though free but only a few tries for each session. Not much useful.
https://www.multisim.com/
This is good. So far I have used for simulating small sections like filters, transistor amplifiers etc. The free version served the purpose.
https://www.falstad.com/mathphysics.html
Various Simulation tools are there. Yet to explore much.
Please note – The information provided here is on as is basis. I don’t guarantee their accuracy and proper functioning.
Hope this save some time for someone.
The concept is for each products there will be one or more subscription plan. End users will be presented with the Subscription plans. And they will buy the subscription.
The subscription plans can be created from both Paypal Dashboard and using REST API. Here is the REST API method.
Request URL
https://api-m.paypal.com/v1/billing/plans/
Method
Post
Header
Authorization: Bearer A3xxxxxxxxxxr-LXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXcOFiuF7__PXXXXXXXXXXXXX_YuJNIHYHGTJG
PayPal-Request-Id: TEST-REQ-ID-12345 —- This is optional. Passing this will make consequent requests work on same initial Request. Better to omit it.
BODY
{
"product_id": "PRODCUCT ID OF CORRESPONDING PRODUCT",
"name": "THE NAME of Subscription Plan GOES HERE",
"description": "THE DESCRIPTION Subscription Plan GOES HERE",
"billing_cycles": [
{
"frequency": {
"interval_unit": "MONTH",
"interval_count": 1
},
"tenure_type": "REGULAR",
"sequence": 1, //sequence is important when there are trials. Trials will be 1 and regular packages can be 2 onwards.
"total_cycles": 0, // 0 means unlimited
"pricing_scheme": {
"fixed_price": {
"value": "1.99",
"currency_code": "USD"
}
}
}
],
"payment_preferences": {
"auto_bill_outstanding": true,
"setup_fee": {
"value": "0",
"currency_code": "USD"
},
"setup_fee_failure_action": "CONTINUE",
"payment_failure_threshold": 1
},
"taxes": {
"percentage": "0",
"inclusive": false
}
}
Return
This will return the auto-generated Plan-ID. The plan id will be needed for integration in frontend. The Plan-ID can also be found from the Paypal Dashboard's subscription section.
Request URL
https://api-m.paypal.com/v1/catalogs/products
Method: Post
Header
Authorization: Bearer xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx // xxxxxxxxxxxxxxxx is base64 encoded Client ID:Secret // base64_encode(client_id_string:client_secret_string) – note the colon in between
PayPal-Request-Id:TEST-REQ-ID-12345 —- This is optional. Passing this will make consequent requests work on same initial Request. Better to omit it.
Body
{
"id": "YOUR OWN PRODUCT ID",
"name": "NAME",
"status": "ACTIVE",
"description": "DESCRIPTION GOES HERE",
"type":"DIGITAL", //SUITABLE TYPE
"category":"SOFTWARE", //SUITABLE CATEGORY
"home_url":"YOUR WEBSITE PAGE - WHERE DETAILS OF PRODUCT IS THERE"
}
Return
The call will return the same details on success
Request URL
https://api-m.paypal.com/v1/oauth2/token
Method
Post
Headers
Authorization: Basic xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx // xxxxxxxxxxxxxxxx is base64 encoded Client ID:Secret // base64_encode(client_id_string:client_secret_string) – note the colon in between
Body
grant_type:client_credentials
Return
{
"scope": "https://uri.paypal.com/services/invoicing https://uri.paypal.com/services/disputes/read-buyer https://uri.paypal.com/services/payments/realtimepayment https://uri.paypal.com/services/disputes/update-seller https://uri.paypal.com/services/payments/payment/authcapture openid https://uri.paypal.com/services/disputes/read-seller https://uri.paypal.com/services/payments/refund https://api.paypal.com/v1/vault/credit-card https://api.paypal.com/v1/payments/.* https://uri.paypal.com/payments/payouts https://api.paypal.com/v1/vault/credit-card/.* https://uri.paypal.com/services/subscriptions https://uri.paypal.com/services/applications/webhooks",
"access_token": "AYYYYYYYYYYWmTopNAjV__Yuk_6AP9RZWQpzxxxxxxxxxxxxxx1ifvHLHrE6RW_Zqjbieo3jcZr9999999999999999lyDA",
"token_type": "Bearer",
"app_id": "APP-XYXYXYXYXYXYCCCC",
"expires_in": 32400,
"nonce": "2021-06-18T16:42:YUKJUKJHTGTYJKHGRRFHFHFGFGBFBG-spy-N9iguUHTJbTgVjht"
}
After a few years I started working with an ESP-01 again. But after so many years I forgot the exact parameters of module I have and was using default settings. For hours I couldn’t flash anything to it. Everytime flashing failed with one error or other. The most occurring errors are :
The above problems can be due to two reasons mainly
Though many suggested that these errors are due to incompatible signal levels between Arduino and ESP but in my case it was not. Previously also I had successfully flashed without logic level converters.
Proper parameters for ESP-01. Please note Flash mode will need to be set as per the chip. Newer ones need DOUT specifically. Whereas the old ones work with both QIO and DOUT. Burning with wrong mode will result in a successful upload but the code will not work.
Solar Panel Output Calculator- Estimate the Real Energy You Can Get From Your Solar Panels
https://www.renogy.com/calculators#tab_solar-size
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