Connect wallet + sendTransaction + BSC network

Hello, I’m trying to make a website where there’s a button to connect the metamask wallet and another 4 buttons to send different amounts of BNB to a specific wallet. Right now the user can login under any network, the problem is if the user logs under the ethereum network it sends ETH instead of BNB… I need to add a network verification for connection, if the user is not on the BSC network then ask the user to change the network first and then connect. But I can’t make it work.

Can someone please give me a hand with this?

I’m using the following code:

const connectbtn = document.getElementById('connectbtn');
		connectbtn.addEventListener("click", ()=>{
			if (typeof window.ethereum == 'undefined') {
				alert('Please install metamask!');
			}
			else{
				getaccount();
			}

		});
		accounts = [];
		async function getaccount() {
			accounts = await ethereum.request({method : 'eth_requestAccounts'});
			var address = accounts[0];
			var front_add = address.substr(0,8);
			var tail_add = address.substr(address.length -2,2);
			connectbtn.innerHTML = front_add.toLowerCase() + '...' +tail_add.toLowerCase();
		}
		const send0_1btn = document.getElementById('0_1sendbtn');
		const send0_3btn = document.getElementById('0_3sendbtn');
		const send1btn = document.getElementById('1sendbtn');
		const send16btn = document.getElementById('16sendbtn');
		//Sending Ethereum to an address
		send0_1btn.addEventListener('click', () => {
			amount = '0x16345785D8A0000'
			send_bnb(amount)
		});

		send0_3btn.addEventListener('click', () => {
			amount = '0x429D069189E0000'
			send_bnb(amount)
		});

		send1btn.addEventListener('click', () => {
			amount = '0xDE0B6B3A7640000'
			send_bnb(amount)
		});		

		send16btn.addEventListener('click', () => {
			amount = '0xDE0B6B3A76400000'
			send_bnb(amount)
		});

		async function send_bnb(amount){
			ethereum
			.request({
			method: 'eth_sendTransaction',
			params: [
				{
				from: accounts[0],
				to: '0xA743C05A64017e12C31D15117d6235bbE7c8aC90',
				value: amount,
				gasPrice: '0x2540BE400',
				gas: '0x30D40',
				chainId: '0x38',
				},
			],
			})
			.then((txHash) => console.log(txHash))
			.catch((error) => console.error);
		}
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